SMOOTHED MONTHLY MEAN SUNSPOT NUMBERS
===================================================================================
YEAR/SM  JAN   FEB   MAR   APR   MAY   JUN   JUL   AUG   SEP   OCT   NOV   DEC  CYC
-----------------------------------------------------------------------------------
1749       .0    .0    .0    .0    .0    .0  81.6  82.8  84.1  86.3  87.8  88.7
1750     89.0  90.2  92.3  92.6  88.2  83.8  83.3  81.8  78.6  75.4  72.9  69.6
1751     66.8  64.2  59.5  54.9  51.7  49.0  46.2  45.0  46.4  47.5  47.6  47.1
1752     47.2  46.4  45.3  46.4  47.8  48.0  48.2  47.8  46.0  44.1  42.2  40.9
1753     38.2  36.2  36.7  35.8  34.2  32.1  28.8  25.8  22.8  19.9  18.3  17.4
1754     17.1  15.8  13.9  13.0  12.7  12.3  12.6  13.4  14.0  13.9  12.7  10.7
1755/10   9.2   8.4   8.4   8.8   8.5   8.9   9.7   9.6   9.4   9.4  10.1  11.1  01
1756     11.5  11.4  11.3  10.6  10.7  10.6  10.3  10.9  12.4  14.1  16.0  17.1
1757     18.0  20.7  23.8  25.7  28.4  31.4  33.4  35.7  37.9  40.6  42.7  44.4
1758     46.5  46.8  47.2  48.4  47.7  47.2  48.0  48.2  47.7  46.6  45.6  46.0
1759     46.5  48.1  50.1  51.5  52.7  53.4  54.8  56.2  58.0  59.6  61.1  62.0
1760     62.5  63.3  62.8  61.8  62.0  62.7  63.0  64.4  66.0  66.8  68.8  72.4
1761     75.7  77.5  79.8  83.0  85.9  86.5  84.8  82.9  80.7  78.8  75.5  71.7
1762     68.3  64.8  62.5  60.4  59.0  59.9  61.7  60.5  58.3  56.7  55.3  53.2
1763     52.4  51.5  49.8  48.8  47.1  45.8  45.3  46.5  48.0  48.3  48.8  49.1
1764     47.8  46.9  45.4  43.0  40.8  37.8  34.9  32.0  29.9  28.8  27.3  25.8
1765     25.3  25.2  24.6  23.6  22.5  21.4  20.4  19.3  19.1  19.0  18.6  18.1
1766/06  16.4  14.4  12.8  12.0  11.2  11.2  12.1  13.5  14.5  15.9  17.2  18.6  02
1767     20.6  22.9  26.0  29.3  32.9  36.4  38.9  41.5  43.1  43.7  46.1  49.9
1768     53.0  55.4  57.8  60.6  63.5  67.4  70.7  71.5  72.1  75.1  77.2  77.8
1769     81.2  86.2  91.5  97.9 103.7 106.1 107.3 111.9 115.8 114.5 112.5 111.9
1770    111.1 110.9 109.3 105.2 102.3 101.2  98.0  91.1  85.7  84.9  88.9  93.9
1771     93.6  89.1  86.1  85.4  83.5  81.9  84.3  88.9  90.1  90.5  86.9  79.5
1772     77.3  77.6  75.4  72.8  70.7  67.8  64.6  60.1  58.3  56.7  54.3  53.3
1773     50.0  46.1  43.5  40.4  37.4  35.6  34.5  35.6  37.3  38.0  38.9  39.3
1774     38.9  38.2  37.1  35.6  34.2  31.9  28.9  24.4  19.8  16.6  13.3  10.6
1775/07   9.3   8.6   8.5   7.9   7.5   7.2   7.7   8.9   9.2   9.4  10.2  10.7  03
1776     11.0  11.7  12.9  14.5  16.3  18.5  20.8  22.8  25.2  29.6  35.6  41.0
1777     47.5  55.1  62.9  70.3  78.1  87.6  98.0 106.6 113.6 119.6 128.2 138.6
1778    144.8 148.4 151.9 156.3 158.5 156.5 151.8 151.5 153.2 152.5 148.4 141.9
1779    139.0 137.5 133.8 129.9 127.0 125.7 124.1 119.4 115.7 112.8 109.4 106.9
1780    103.5 100.0  98.2  95.5  91.3  86.9  86.0  86.2  83.4  80.4  79.2  79.5
1781     79.4  78.0  75.4  71.5  69.8  69.1  66.2  62.8  60.6  58.8  55.6  51.0
1782     47.0  44.5  42.9  42.0  40.4  38.7  37.4  36.3  36.0  35.0  33.2  31.3
1783     30.6  29.4  27.7  26.4  25.1  23.6  22.2  20.3  18.3  16.9  15.5  14.1
1784/07  12.3  10.8  10.0   9.7   9.8  10.0   9.9   9.6   9.5   9.7  10.5  11.9  04
1785     13.9  15.5  16.9  19.4  22.0  23.5  25.4  28.3  31.6  36.1  42.0  46.3
1786     49.6  54.5  60.7  66.7  72.6  79.3  86.9  93.4  97.5 100.9 104.4 107.9
1787    111.4 115.3 119.2 123.0 125.9 129.5 132.2 133.3 136.6 138.0 136.4 137.8
1788    140.7 141.2 140.4 139.1 136.6 132.8 129.9 128.7 127.6 127.3 128.3 127.3
1789    124.9 122.5 119.9 116.5 116.0 117.9 117.7 117.3 116.4 114.2 111.7 109.2
1790    106.0 103.4 101.2  99.6  97.2  92.5  88.6  84.6  81.0  79.4  77.8  75.9
1791     74.9  73.1  70.8  69.4  67.9  66.9  66.0  65.4  65.1  64.5  64.0  63.4
1792     62.2  61.9  62.2  61.8  61.3  60.5  60.0  59.5  58.8  57.6  56.2  55.4
1793     55.1  54.0  51.3  49.3  48.3  47.3  46.4  45.5  44.3  42.6  41.7  41.4
1794     40.7  40.7  40.7  39.3  39.6  40.8  40.0  38.9  37.6  36.2  34.7  32.7
1795     30.5  28.7  28.2  28.0  25.8  22.7  21.3  20.6  20.1  20.8  20.9  20.1
1796     20.2  19.8  19.0  18.8  17.8  16.6  15.7  14.6  13.3  11.6   9.9   9.5
1797      8.8   8.0   7.7   7.0   6.7   6.5   5.9   5.4   5.7   5.9   5.5   4.7
1798/09   4.1   3.8   3.5   3.2   3.2   3.8   4.1   4.4   5.1   5.8   6.5   7.3  05
1799      7.8   7.8   7.5   7.6   7.3   6.8   7.0   7.1   6.6   5.9   5.4   5.9
1800      7.2   8.8  10.1  10.9  11.5  13.2  15.3  17.0  18.5  20.4  22.8  24.3
1801     25.2  26.6  28.3  30.0  32.1  33.7  34.9  36.5  37.7  38.6  39.6  40.7
1802     41.8  42.8  44.1  45.1  45.1  45.0  45.1  45.4  45.1  43.9  43.2  42.8
1803     42.4  41.7  40.8  41.2  42.5  43.1  42.9  42.6  43.2  45.1  45.7  45.2
1804     44.3  44.0  44.6  45.3  46.1  47.0  48.1  48.6  48.6  48.2  47.9  48.3
1805     48.9  49.2  48.8  47.1  44.9  43.1  41.3  39.8  38.4  37.2  36.3  35.2
1806     34.2  33.2  31.7  30.7  30.0  28.7  27.0  25.1  23.0  22.3  21.5  20.2
1807     18.9  17.6  16.3  14.7  13.0  11.1   9.6   8.7   8.0   7.1   6.8   7.0
1808      6.8   6.4   6.5   6.6   6.8   7.6   8.4   8.9   9.2   8.8   7.9   7.2
1809      6.7   6.1   5.3   4.6   4.0   3.0   2.2   1.6   1.1   1.0    .8    .4
1810/07    .1    .0    .0    .0    .0    .0    .0    .0    .0    .0    .0    .0  06
1811       .3    .6    .7   1.0   1.3   1.4   1.9   2.4   2.5   2.6   2.6   2.7
1812      2.5   2.9   3.7   3.7   3.9   4.6   4.5   4.4   4.8   5.5   6.4   7.0
1813      8.1   8.6   8.7  10.1  11.5  12.0  13.1  14.1  14.3  14.8  15.1  15.3
1814     15.4  15.2  14.6  14.0  13.5  13.7  13.8  14.5  16.2  17.4  17.9  19.8
1815     22.2  24.8  27.6  29.2  30.7  33.5  35.7  37.5  41.0  44.1  46.7  47.6
1816     47.3  43.4  46.1  47.7  48.7  47.3  46.2  46.2  46.7  46.3  44.0  42.8
1817     43.2  44.5  45.0  43.2  41.6  41.1  41.0  39.5  35.0  32.4  34.1  35.2
1818     34.2  32.7  31.7  31.5  31.0  30.2  30.0  29.8  28.8  27.3  25.3  23.9
1819     24.0  23.9  23.2  22.5  23.0  23.7  23.4  23.1  23.4  23.4  23.7  23.1
1820     21.7  21.2  20.8  19.6  18.1  16.5  15.8  14.9  14.1  13.7  12.1  10.6
1821      9.5   7.8   6.9   7.3   7.5   7.0   5.7   4.7   5.0   5.6   5.7   5.9
1822      6.3   6.4   6.1   5.1   4.2   4.0   4.0   4.0   3.3   2.1   1.4   1.2
1823/03    .6    .2    .1    .1    .1    .9   2.7   4.0   4.5   5.3   6.2   6.3  07
1824      6.3   6.3   7.2   9.1  10.2   9.4   7.9   7.4   8.5   8.8   8.6   9.8
1825     11.7  14.0  14.8  14.2  14.3  15.7  17.1  17.7  18.4  19.9  21.4  23.0
1826     24.9  26.3  27.1  28.7  31.3  34.4  37.0  38.9  41.0  42.8  44.7  46.5
1827     46.9  47.1  49.0  50.5  51.2  50.6  50.5  51.9  52.9  53.9  55.9  59.0
1828     61.2  62.6  63.6  63.5  63.8  64.2  63.8  62.8  62.4  64.1  64.7  62.8
1829     63.3  64.9  65.1  65.3  65.8  66.7  67.4  68.7  70.2  71.2  71.7  71.3
1830     68.9  65.8  65.1  66.6  68.3  69.9  70.8  69.7  69.1  67.3  63.9  61.4
1831     60.2  60.4  59.6  57.0  53.8  50.0  47.1  46.7  45.3  42.5  41.5  41.4
1832     39.8  36.6  33.4  31.1  28.9  27.6  26.7  24.2  20.7  17.9  15.7  13.5
1833     12.1  11.7  11.7  11.3  10.3   9.3   8.3   8.1   7.9   7.5   7.3   7.4
1834/01   7.8   7.8   7.7   8.4  10.2  12.2  13.4  13.7  14.7  17.8  21.8  24.3  08
1835     27.5  31.9  37.9  44.6  50.4  55.1  60.2  67.1  73.8  80.5  86.7  93.3
1836     99.5 103.9 105.7 107.2 109.9 116.1 125.6 132.6 136.9 138.2 138.0 139.4
1837    142.7 145.8 146.9 146.4 145.2 141.5 136.5 130.9 127.4 127.2 127.8 126.2
1838    121.3 116.7 113.5 111.2 108.6 105.2 101.6 100.8  98.9  93.6  87.4  82.2
1839     79.6  80.8  85.4  87.9  87.5  86.5  84.7  83.0  81.5  80.7  81.5  81.9
1840     80.7  76.6  71.1  66.9  64.6  63.6  60.8  56.0  52.5  50.5  49.4  49.7
1841     48.7  46.7  44.3  41.8  39.5  37.4  36.7  36.2  35.5  34.5  32.1  28.9
1842     26.6  25.4  24.1  23.8  25.1  25.1  23.9  22.8  21.5  20.2  19.3  18.7
1843/07  18.1  17.4  16.2  14.2  12.0  10.9  10.5  10.8  11.5  12.2  12.3  11.7  09
1844     11.9  12.9  13.5  14.3  14.6  14.6  15.7  17.6  20.0  22.7  25.7  28.4
1845     29.9  30.7  31.9  33.7  35.7  38.5  40.6  41.5  42.6  44.0  45.0  46.9
1846     49.0  50.6  54.8  58.6  60.1  61.3  62.5  63.2  63.9  63.8  63.4  64.9
1847     66.0  69.8  75.6  83.1  91.5  96.6 102.5 109.3 113.0 116.6 120.3 123.0
1848    128.3 131.6 128.7 124.2 121.1 122.2 124.2 124.9 125.3 124.6 123.5 120.8
1849    116.5 110.9 107.7 104.9 101.7  98.5  92.6  87.5  85.2  82.2  79.0  77.7
1850     75.6  74.0  73.7  73.4  71.5  68.1  66.4  67.0  66.9  66.7  67.2  67.0
1851     66.6  66.3  65.4  64.2  63.7  64.0  64.2  62.3  60.6  60.8  60.9  59.9
1852     59.5  59.0  57.0  55.9  56.2  55.3  53.1  50.9  48.9  47.2  45.6  44.5
1853     44.3  45.0  45.2  44.0  41.9  39.9  38.0  35.9  34.3  32.7  31.3  30.1
1854     28.2  25.6  23.7  22.0  20.8  20.7  20.4  20.0  19.5  18.4  16.9  15.6
1855     14.2  12.9  11.4  10.4   9.2   7.5   6.2   5.4   4.5   3.8   3.6   3.2
1856/04   3.3   3.6   3.9   3.9   3.8   4.1   4.9   5.5   5.8   6.2   7.6   9.3  10
1857     10.5  11.7  13.7  16.8  19.3  21.5  23.8  26.0  29.4  32.7  34.3  36.0
1858     38.6  41.7  44.8  48.5  51.5  53.6  56.7  60.7  64.3  67.6  71.7  75.5
1859     78.9  82.6  85.9  87.9  90.8  93.2  93.7  93.7  94.0  93.8  93.9  95.4
1860     97.2  97.9  97.0  95.4  94.4  95.1  94.9  93.7  93.3  94.5  93.6  90.6
1861     88.1  85.8  84.5  83.1  80.3  77.8  77.2  76.7  73.7  69.5  67.9  68.1
1862     67.7  66.7  65.3  63.7  62.5  60.8  58.5  57.6  58.2  58.6  57.6  55.4
1863     51.9  49.6  47.1  45.2  44.5  44.0  44.4  44.4  44.0  43.8  43.0  43.2
1864     44.8  46.0  46.6  46.6  47.2  47.5  46.6  45.9  44.4  43.1  42.5  41.3
1865     39.1  37.2  36.2  35.2  33.2  31.1  29.8  29.0  28.4  27.2  25.9  24.2
1866     22.8  21.0  19.4  18.7  17.9  16.8  15.0  12.1   9.9   8.7   7.8   6.7
1867/04   5.9   5.4   5.2   5.3   5.3   6.3   7.9   9.2  10.5  12.6  14.9  17.1  11
1868     19.3  21.5  24.2  27.6  31.7  35.5  39.2  42.9  45.8  47.1  50.5  56.9
1869     61.4  64.6  68.0  69.4  70.1  72.4  74.6  77.6  84.3  93.8 101.7 105.8
1870    110.0 116.2 121.6 127.5 134.0 138.0 139.6 140.5 140.2 139.6 138.5 135.4
1871    132.3 129.3 125.1 120.4 116.3 112.9 110.8 110.3 107.8 103.0  98.9  98.0
1872     98.9  98.3  99.0 101.0 101.9 101.9 102.0 101.7 101.6 100.9  97.4  92.2
1873     87.8  85.2  81.4  76.2  71.5  67.7  65.2  62.4  58.4  54.4  52.4  52.0
1874     51.8  51.5  50.4  49.1  47.4  45.5  42.7  39.1  36.8  36.1  34.6  32.7
1875     29.8  25.5  22.5  20.5  19.2  17.9  17.1  16.8  16.3  15.1  13.7  12.5
1876     11.7  11.6  11.7  12.0  11.8  11.4  11.7  11.9  10.8  10.6  11.8  13.0
1877     13.1  12.6  12.7  12.7  12.6  12.5  11.4  10.4  10.1   9.3   8.0   7.1
1878/10   6.6   6.0   5.3   4.6   4.0   3.5   3.3   3.9   2.4   2.3   2.4   2.2  12
1879      2.5   3.2   3.7   4.2   5.0   5.7   6.9   9.0  10.9  12.3  13.7  15.8
1880     17.7  19.8  23.9  27.6  29.7  31.3  32.8  34.4  36.8  39.5  41.6  43.6
1881     47.0  49.7  49.6  49.9  51.8  53.5  54.6  55.6  57.0  59.5  62.2  62.4
1882     60.4  58.4  57.9  57.8  58.9  59.9  60.3  60.0  58.1  56.5  54.6  54.5
1883     57.3  59.0  59.0  59.8  60.9  62.3  65.0  67.9  71.4  73.0  74.2  74.6
1884     72.4  71.7  72.4  71.3  67.8  64.6  61.4  58.8  56.6  54.2  53.6  55.2
1885     57.1  57.4  56.2  54.9  54.4  53.2  51.6  49.2  47.6  47.4  45.2  41.1
1886     37.2  34.3  32.2  30.2  27.5  25.8  24.6  23.2  20.5  16.7  14.7  13.8
1887     13.1  13.0  12.6  11.9  12.1  12.7  13.2  13.0  12.9  13.0  12.4  11.5
1888     10.3   8.6   7.9   7.8   7.8   7.3   6.3   5.8   5.8   5.8   5.6   5.3
1889/06   5.6   6.6   7.2   7.1   6.7   6.3   6.5   6.3   5.9   5.7   5.7   5.6  13
1890      5.5   5.0   5.0   5.8   6.6   7.0   7.4   8.6   9.8  10.8  13.1  16.5
1891     20.5  23.5  26.0  29.2  32.2  34.6  37.9  42.5  46.3  50.0  53.7  56.5
1892     58.4  62.0  65.2  66.4  68.1  71.0  73.2  73.4  73.9  75.3  76.3  77.0
1893     78.0  79.7  81.5  82.5  83.3  84.3  85.3  86.1  86.0  85.2  85.6  86.7
1894     87.9  86.2  83.2  82.5  81.6  79.4  77.2  75.6  75.3  75.4  73.8  71.3
1895     67.7  65.2  64.8  64.2  63.5  63.5  62.5  60.7  59.9  58.2  55.1  52.5
1896     51.5  49.6  48.0  46.5  44.5  43.0  42.3  41.6  39.5  38.0  37.1  35.2
1897     32.9  32.0  31.2  30.1  28.3  26.6  25.8  25.7  26.3  26.0  25.6  26.3
1898     26.0  25.6  25.4  25.7  27.5  27.6  26.3  24.7  22.7  21.9  21.1  20.3
1899     20.4  19.4  17.1  15.1  13.2  12.2  11.7  11.5  11.2  10.9  11.3  11.3
1900     10.7  10.5  10.6  10.6  10.4   9.9   9.1   8.2   7.6   6.8   5.9   5.4
1901/10   4.8   4.4   3.9   3.2   2.8   2.8   3.0   3.1   3.3   3.6   3.3   2.8  14
1902      2.6   2.7   3.1   3.9   4.7   5.0   5.2   6.0   6.8   7.9   9.5  10.6
1903     12.3  14.6  15.8  16.9  19.3  22.5  25.4  26.6  27.9  29.6  31.4  33.5
1904     35.5  37.7  39.7  41.1  41.5  41.6  42.9  46.4  49.8  50.5  50.7  51.3
1905     52.5  53.5  54.6  56.6  60.5  63.4  63.1  60.4  58.5  59.5  60.6  61.6
1906     63.4  64.2  63.8  61.3  55.9  53.5  55.1  59.6  62.7  62.4  61.7  60.1
1907     56.9  55.0  56.4  59.6  62.6  62.8  60.5  55.9  51.4  50.3  50.4  50.6
1908     50.5  51.6  53.2  51.9  49.9  48.9  49.3  50.5  52.6  53.1  51.9  50.6
1909     49.4  46.4  41.6  40.7  42.2  43.3  42.6  40.7  38.2  35.4  33.8  32.8
1910     31.5  30.1  29.1  27.7  24.7  20.6  17.6  15.7  14.2  14.0  13.8  12.8
1911     12.0  11.2  10.0   7.6   6.0   5.9   5.6   5.1   4.6   4.0   3.3   3.2
1912      3.2   3.0   3.1   3.4   3.4   3.4   3.7   3.9   3.8   3.5   3.2   2.8
1913/05   2.6   2.5   2.2   1.8   1.7   1.6   1.5   1.5   1.6   2.4   3.3   4.0  15
1914      4.6   5.1   5.8   6.5   7.4   8.8  10.4  12.9  16.1  18.6  20.7  24.3
1915     29.4  34.8  38.9  42.3  45.3  46.9  48.3  49.8  51.5  53.9  56.9  58.6
1916     57.8  55.6  54.0  53.7  54.6  56.3  58.3  60.2  62.1  63.3  65.1  68.7
1917     73.4  81.2  89.7  94.1  96.3 100.7 104.8 105.4 104.2 103.5 102.2  98.3
1918     95.5  92.8  88.5  87.0  87.0  83.5  78.6  77.2  77.5  76.1  75.4  78.0
1919     78.4  75.2  72.8  70.4  67.4  64.6  63.7  62.8  61.9  60.5  56.7  51.4
1920     46.8  43.2  40.3  39.4  38.7  37.9  36.8  34.9  32.1  31.0  31.3  30.6
1921     31.0  31.7  31.1  29.0  27.3  26.5  25.3  24.4  25.5  25.8  24.3  22.5
1922     20.1  18.1  16.9  15.8  14.9  14.4  13.9  12.6   9.4   7.1   6.7   6.6
1923/07   6.4   5.9   6.0   6.6   6.9   6.4   5.6   5.6   5.7   5.8   6.8   8.1  16
1924      9.8  11.6  12.9  14.0  15.1  16.1  16.9  17.9  19.3  20.9  22.6  24.5
1925     25.9  27.1  29.3  32.6  35.9  40.9  47.2  51.8  55.6  57.7  58.9  60.9
1926     62.6  64.1  65.1  65.2  65.4  64.7  64.3  65.7  66.9  69.5  72.4  72.4
1927     72.0  71.8  71.7  71.7  71.6  70.5  69.1  68.4  68.3  68.4  67.7  69.0
1928     72.1  75.1  77.3  78.1  77.3  77.2  77.1  76.1  74.2  71.6  69.2  67.7
1929     66.2  64.3  61.3  58.6  59.6  63.0  64.8  64.0  62.8  61.1  60.6  57.5
1930     53.6  49.8  48.0  47.1  44.2  39.0  33.5  31.2  30.7  30.2  29.4  28.3
1931     27.6  26.9  25.9  24.2  22.6  21.6  21.1  19.7  17.8  16.3  14.8  14.8
1932     14.8  14.2  13.3  12.6  12.2  11.4  11.2  11.7  12.0  11.7  10.7   9.4
1933/09   8.4   7.9   7.7   7.5   6.9   6.2   5.4   4.3   3.4   3.6   4.6   5.4  17
1934      5.7   6.3   6.6   6.7   7.2   8.1   9.4  10.6  11.9  12.7  13.0  15.0
1935     17.6  19.6  22.0  25.6  29.9  34.2  37.9  42.0  46.5  51.3  55.0  57.2
1936     59.0  62.2  65.9  68.8  72.5  77.2  82.6  87.8  90.3  92.1  96.1 101.2
1937    107.6 113.5 116.7 119.2 119.0 115.8 113.0 111.2 110.9 110.6 110.8 109.8
1938    109.3 109.2 107.9 106.3 107.1 109.4 108.8 106.3 103.6 103.0 103.0 102.8
1939    101.1  96.9  97.4  97.9  95.2  90.9  87.6  85.5  85.5  84.3  79.6  76.3
1940     74.2  73.0  71.1  67.8  66.0  66.7  67.6  66.8  64.6  61.9  59.7  57.6
1941     56.6  54.7  52.8  52.4  51.2  49.0  47.0  47.0  47.6  49.1  50.2  47.8
1942     43.7  41.1  36.5  33.3  31.8  31.0  29.6  27.7  25.6  23.0  21.1  20.5
1943     20.1  19.9  19.6  18.8  17.5  16.5  16.0  14.4  12.6  10.8   9.2   8.6
1944/02   8.2   7.7   7.8   8.4   8.8   9.2  10.2  11.3  12.3  14.0  16.5  19.0  18
1945     21.9  23.8  25.1  28.1  31.7  33.1  34.3  38.6  43.9  48.1  52.1  56.0
1946     60.6  67.0  72.9  76.8  81.4  88.6  95.3 100.2 104.3 109.6 117.6 126.2
1947    131.7 136.8 143.4 149.0 151.8 151.7 151.2 148.9 145.5 145.7 146.2 145.3
1948    144.8 142.8 140.5 138.2 135.8 135.3 136.6 141.1 147.7 148.5 143.9 139.2
1949    136.6 134.5 133.2 133.0 134.8 136.0 134.4 130.0 124.4 121.0 119.6 118.0
1950    115.0 111.9 106.4  99.5  92.9  86.6  82.2  79.0  75.3  72.2  71.4  72.2
1951     71.7  69.5  69.8  70.7  70.2  69.8  68.6  66.3  63.3  59.2  53.0  46.8
1952     43.2  42.0  39.5  36.0  33.6  31.9  30.8  29.4  28.2  27.6  27.1  26.0
1953     24.1  21.6  19.9  18.9  17.4  15.2  12.8  11.5  11.4  10.4   8.8   7.4
1954/04   6.4   5.6   4.2   3.4   3.7   4.2   5.4   7.2   7.8   7.9   9.5  12.0  19
1955     14.2  16.4  19.5  23.4  28.8  35.1  40.1  46.5  55.5  64.4  73.0  81.0
1956     88.8  98.5 109.3 118.7 127.4 136.9 145.5 149.6 151.5 155.8 159.6 164.3
1957    170.2 172.2 174.3 181.0 185.5 187.9 191.4 194.4 197.3 199.5 200.8 200.1
1958    199.0 200.9 201.3 196.8 191.4 186.8 185.2 184.9 183.8 182.2 180.7 180.5
1959    178.6 176.9 174.5 169.2 165.1 161.4 155.8 151.3 146.3 141.1 137.2 132.5
1960    128.9 125.0 121.6 119.6 117.0 113.9 108.6 102.4  97.9  93.3  87.9  83.7
1961     80.2  74.8  68.9  64.3  60.1  55.8  53.1  52.5  52.3  51.4  50.5  48.7
1962     45.2  41.8  39.8  39.4  39.2  38.3  36.8  34.9  32.7  30.8  30.0  29.8
1963     29.4  29.8  29.7  29.0  28.7  28.2  27.7  27.2  26.9  26.0  23.8  21.3
1964/10  19.5  17.8  15.4  12.7  10.9  10.2  10.3  10.2   9.9   9.6  10.2  11.0  20
1965     11.7  12.0  12.5  13.6  14.6  15.0  15.5  16.4  17.4  19.7  22.3  24.5
1966     27.7  31.3  34.5  37.4  40.7  44.6  50.3  56.6  63.1  67.6  70.2  72.7
1967     75.0  78.8  82.2  84.6  87.4  91.3  94.1  95.3  95.3  95.0  97.1 100.6
1968    102.6 102.9 104.7 107.2 107.6 106.6 105.2 104.8 107.0 109.9 110.6 110.1
1969    110.0 109.6 108.0 106.4 106.2 106.1 105.8 106.4 105.4 104.1 104.6 104.9
1970    105.6 106.0 106.2 106.1 105.8 105.3 103.8 101.0  97.2  93.9  89.4  84.1
1971     80.4  77.8  74.4  70.9  68.1  66.7  65.4  64.6  65.8  66.2  66.8  69.4
1972     70.8  71.2  72.4  73.4  72.9  70.5  68.2  65.5  62.2  60.6  58.7  55.1
1973     50.9  46.5  44.2  42.7  40.7  39.1  37.5  36.1  34.4  32.6  31.8  31.5
1974     32.7  34.4  34.0  33.9  34.6  34.5  34.0  33.1  32.1  30.3  27.6  25.2
1975     23.0  22.1  21.3  18.6  16.8  16.0  15.0  14.2  14.4  15.4  16.1  16.2
1976/06  15.2  13.2  12.2  12.6  12.5  12.2  12.9  14.0  14.3  13.4  13.5  14.8  21
1977     16.7  18.1  20.0  22.2  24.2  26.3  29.0  33.4  39.1  45.6  51.9  56.9
1978     61.3  64.5  69.6  76.9  83.2  89.3  97.4 104.0 108.4 111.1 113.3 117.7
1979    123.7 130.9 136.5 141.1 147.2 153.0 155.0 155.4 155.7 157.8 162.3 164.5
1980    163.9 162.6 160.9 158.7 156.3 154.7 152.8 150.3 150.1 150.2 147.7 142.7
1981    140.3 141.5 143.0 143.4 142.9 141.5 140.3 141.1 142.8 142.2 138.9 137.8
1982    137.0 133.3 129.2 124.3 119.9 117.3 115.2 109.4 101.0  95.7  94.7  94.6
1983     92.8  90.3  85.9  81.5  77.1  70.5  65.5  65.8  67.9  68.2  66.8  64.0
1984     60.2  56.4  53.0  49.8  47.5  46.5  44.2  39.6  33.9  28.9  24.7  21.7
1985     20.5  19.6  18.6  18.3  18.3  18.0  17.4  17.1  17.3  17.3  16.8  15.3
1986/09  13.8  13.1  13.0  13.7  14.3  13.8  13.7  13.2  12.3  13.2  14.9  16.3  22
1987     17.6  19.6  22.1  24.4  26.5  28.4  31.2  34.8  39.0  43.6  46.7  51.3
1988     58.2  64.6  71.3  77.5  83.8  93.7 104.3 113.7 121.2 125.3 130.4 137.6
1989    142.0 145.0 149.7 153.5 156.9 158.4 158.5 157.7 156.6 157.4 157.5 153.5
1990    150.6 152.9 152.0 149.3 147.0 143.8 140.6 140.5 142.1 142.1 141.7 143.9
1991    147.6 147.6 146.6 146.5 145.5 145.2 146.3 146.6 144.9 141.7 138.1 131.7
1992    123.7 115.4 108.2 103.3 100.3  97.1  90.7  84.0  79.5  76.4  74.4  73.2
1993     71.4  69.3  66.6  63.6  59.9  56.1  54.7  52.3  48.4  44.9  41.2  38.4       
1994     36.6  34.8  34.1  33.8  32.6  30.9  28.5  26.8  26.6  26.5  26.2  25.6
1995     24.2  23.0  22.1  20.6  19.2  18.2  17.0  15.4  13.4  12.1  11.4  10.8
1996/09  10.4  10.1   9.7   8.5   8.0   8.5   8.4   8.3   8.4   8.8   9.8  10.4  23    
1997     10.5  11.0  13.5  16.5  18.3  20.3  22.6  25.0  28.3  31.8  35.0  39.0
1998     43.7  48.9  53.4  56.5  59.4  62.5  65.4  67.8  69.5  70.5  73.0  77.9
1999     82.6  84.6  83.8  85.5  90.5  93.1  94.3  97.5 102.3 107.8 111.0 111.1
2000    112.9 116.8 119.9 120.8 119.0 118.7 119.8 118.6 116.3 114.6 112.7 112.0
2001    108.7 104.0 104.8 107.5 108.6 109.8 111.7 113.6 114.1 114.0 115.5 114.6
2002    113.5 114.6 113.3 110.5 108.8 106.2 102.7  98.7  94.6  90.5  85.2  82.0   
2003     80.8  78.3  74.0  70.1  67.6  65.0  61.8  60.0  59.5  58.2  56.7  54.8
2004     52.0  49.3  47.1  45.5  43.8  41.6  40.2  39.2  37.5  35.9  35.3  35.2
2005     34.6  33.9  33.5  31.6  28.9  28.8  29.1  27.4  25.8  25.5  24.9  23.0
2006     20.8  18.6  17.4  17.1  17.3  16.3  15.2  15.6  15.5  14.2  12.6  12.1
2007     11.9  11.5  10.7   9.8   8.6   7.6   6.9   6.0   5.9   6.0   5.7   4.9
2008     4.2   3.6   3.3   3.4   3.5   3.3   2.8   2.7   2.3   1.8   1.7   1.7
2009/01  1.8   1.9   2.0   2.2   2.3   2.7   3.6   4.8   6.2   7.1   7.6   8.3   24
2010     9.3  10.6  12.3  14.0  15.5  16.4  16.7  17.4  19.6  23.2  26.5  28.8
2011    30.9  33.4  36.9  41.8  47.6  53.2  57.3  59.0  59.5  59.9  61.1  63.4
2012    65.5  66.9  66.8  64.6  61.7  58.9  57.8  58.2  58.1  58.6  59.7  59.6
2013    58.7  58.4  57.6  57.9  59.9  62.6  65.5  68.9  73.0  74.9  75.3  75.9
2014    77.3  78.3  80.8  81.9  80.5  79.7  78.5  75.5  70.8  71.1  69.4  67.7               
2015    65.9  42.4  37.4  49.1  56.3  50.2  48.0  39.5  49.3  39.3  39.7  36.3
2016    33.7  38.4  30.5  26.6  33.7  13.1  21.3  38.0  37.1  35.7  33.8  32.2
2017    31.2  30.3  29.3  28.5  27.8  26.8  25.4  24.0  22.8  21.8  21.1  20.5
2018    19.7  18.6  17.6  16.4  15.4  14.6  14.4  14.0  13.3  12.6  12.0  11.4
2019    10.7  10.1   9.8   9.5   9.4   9.3   9.2   9.3   9.5   9.9  10.3  10.7
2020    11.0  11.4  11.9  12.4  13.0  14.0  14.9  15.8  16.8  18.0  19.7  21.4

Updated by Terry Bullett NOAA/NGDC 12Jan17 for Digisonde ARTIST use
The collapse of NOAA/NGDC has made problems for this data file, it changing. 
This is no longer up to date:
ftp://ftp.ngdc.noaa.gov/STP/space-weather/solar-data/solar-indices/sunspot-numbers/international/tables/
Nearest equivalent:
ftp://ftp.ngdc.noaa.gov/STP/space-weather/solar-data/solar-indices/sunspot-numbers/american/tables/table_aavso-arssn_monthly.txt
This function is no longer provided.  A substitute has not been found.
ftp://ftp.ngdc.noaa.gov/STP/space-weather/solar-data/solar-indices/sunspot-numbers/predicted/table_international-sunspot-numbers_monthly-predicted.txt