MONTHLY MEAN SUNSPOT NUMBERS =============================================================================== Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ------------------------------------------------------------------------------- 1749 58.0 62.6 70.0 55.7 85.0 83.5 94.8 66.3 75.9 75.5 158.6 85.2 1750 73.3 75.9 89.2 88.3 90.0 100.0 85.4 103.0 91.2 65.7 63.3 75.4 1751 70.0 43.5 45.3 56.4 60.7 50.7 66.3 59.8 23.5 23.2 28.5 44.0 1752 35.0 50.0 71.0 59.3 59.7 39.6 78.4 29.3 27.1 46.6 37.6 40.0 1753 44.0 32.0 45.7 38.0 36.0 31.7 22.0 39.0 28.0 25.0 20.0 6.7 1754 0.0 3.0 1.7 13.7 20.7 26.7 18.8 12.3 8.2 24.1 13.2 4.2 1755 10.2 11.2 6.8 6.5 0.0 0.0 8.6 3.2 17.8 23.7 6.8 20.0 1756 12.5 7.1 5.4 9.4 12.5 12.9 3.6 6.4 11.8 14.3 17.0 9.4 1757 14.1 21.2 26.2 30.0 38.1 12.8 25.0 51.3 39.7 32.5 64.7 33.5 1758 37.6 52.0 49.0 72.3 46.4 45.0 44.0 38.7 62.5 37.7 43.0 43.0 1759 48.3 44.0 46.8 47.0 49.0 50.0 51.0 71.3 77.2 59.7 46.3 57.0 1760 67.3 59.5 74.7 58.3 72.0 48.3 66.0 75.6 61.3 50.6 59.7 61.0 1761 70.0 91.0 80.7 71.7 107.2 99.3 94.1 91.1 100.7 88.7 89.7 46.0 1762 43.8 72.8 45.7 60.2 39.9 77.1 33.8 67.7 68.5 69.3 77.8 77.2 1763 56.5 31.9 34.2 32.9 32.7 35.8 54.2 26.5 68.1 46.3 60.9 61.4 1764 59.7 59.7 40.2 34.4 44.3 30.0 30.0 30.0 28.2 28.0 26.0 25.7 1765 24.0 26.0 25.0 22.0 20.2 20.0 27.0 29.7 16.0 14.0 14.0 13.0 1766 12.0 11.0 36.6 6.0 26.8 3.0 3.3 4.0 4.3 5.0 5.7 19.2 1767 27.4 30.0 43.0 32.9 29.8 33.3 21.9 40.8 42.7 44.1 54.7 53.3 1768 53.5 66.1 46.3 42.7 77.7 77.4 52.6 66.8 74.8 77.8 90.6 111.8 1769 73.9 64.2 64.3 96.7 73.6 94.4 118.6 120.3 148.8 158.2 148.1 112.0 1770 104.0 142.5 80.1 51.0 70.1 83.3 109.8 126.3 104.4 103.6 132.2 102.3 1771 36.0 46.2 46.7 64.9 152.7 119.5 67.7 58.5 101.4 90.0 99.7 95.7 1772 100.9 90.8 31.1 92.2 38.0 57.0 77.3 56.2 50.5 78.6 61.3 64.0 1773 54.6 29.0 51.2 32.9 41.1 28.4 27.7 12.7 29.3 26.3 40.9 43.2 1774 46.8 65.4 55.7 43.8 51.3 28.5 17.5 6.6 7.9 14.0 17.7 12.2 1775 4.4 0.0 11.6 11.2 3.9 12.3 1.0 7.9 3.2 5.6 15.1 7.9 1776 21.7 11.6 6.3 21.8 11.2 19.0 1.0 24.2 16.0 30.0 35.0 40.0 1777 45.0 36.5 39.0 95.5 80.3 80.7 95.0 112.0 116.2 106.5 146.0 157.3 1778 177.3 109.3 134.0 145.0 238.9 171.6 153.0 140.0 171.7 156.3 150.3 105.0 1779 114.7 165.7 118.0 145.0 140.0 113.7 143.0 112.0 111.0 124.0 114.0 110.0 1780 70.0 98.0 98.0 95.0 107.2 88.0 86.0 86.0 93.7 77.0 60.0 58.7 1781 98.7 74.7 53.0 68.3 104.7 97.7 73.5 66.0 51.0 27.3 67.0 35.2 1782 54.0 37.5 37.0 41.0 54.3 38.0 37.0 44.0 34.0 23.2 31.5 30.0 1783 28.0 38.7 26.7 28.3 23.0 25.2 32.2 20.0 18.0 8.0 15.0 10.5 1784 13.0 8.0 11.0 10.0 6.0 9.0 6.0 10.0 10.0 8.0 17.0 14.0 1785 6.5 8.0 9.0 15.7 20.7 26.3 36.3 20.0 32.0 47.2 40.2 27.3 1786 37.2 47.6 47.7 85.4 92.3 59.0 83.0 89.7 111.5 112.3 116.0 112.7 1787 134.7 106.0 87.4 127.2 134.8 99.2 128.0 137.2 157.3 157.0 141.5 174.0 1788 138.0 129.2 143.3 108.5 113.0 154.2 141.5 136.0 141.0 142.0 94.7 129.5 1789 114.0 125.3 120.0 123.3 123.5 120.0 117.0 103.0 112.0 89.7 134.0 135.5 1790 103.0 127.5 96.3 94.0 93.0 91.0 69.3 87.0 77.3 84.3 82.0 74.0 1791 72.7 62.0 74.0 77.2 73.7 64.2 71.0 43.0 66.5 61.7 67.0 66.0 1792 58.0 64.0 63.0 75.7 62.0 61.0 45.8 60.0 59.0 59.0 57.0 56.0 1793 56.0 55.0 55.5 53.0 52.3 51.0 50.0 29.3 24.0 47.0 44.0 45.7 1794 45.0 44.0 38.0 28.4 55.7 41.5 41.0 40.0 11.1 28.5 67.4 51.4 1795 21.4 39.9 12.6 18.6 31.0 17.1 12.9 25.7 13.5 19.5 25.0 18.0 1796 22.0 23.8 15.7 31.7 21.0 6.7 26.9 1.5 18.4 11.0 8.4 5.1 1797 14.4 4.2 4.0 4.0 7.3 11.1 4.3 6.0 5.7 6.9 5.8 3.0 1798 2.0 4.0 12.4 1.1 0.0 0.0 0.0 3.0 2.4 1.5 12.5 9.9 1799 1.6 12.6 21.7 8.4 8.2 10.6 2.1 0.0 0.0 4.6 2.7 8.6 1800 6.9 9.3 13.9 0.0 5.0 23.7 21.0 19.5 11.5 12.3 10.5 40.1 1801 27.0 29.0 30.0 31.0 32.0 31.2 35.0 38.7 33.5 32.6 39.8 48.2 1802 47.8 47.0 40.8 42.0 44.0 46.0 48.0 50.0 51.8 38.5 34.5 50.0 1803 50.0 50.8 29.5 25.0 44.3 36.0 48.3 34.1 45.3 54.3 51.0 48.0 1804 45.3 48.3 48.0 50.6 33.4 34.8 29.8 43.1 53.0 62.3 61.0 60.0 1805 61.0 44.1 51.4 37.5 39.0 40.5 37.6 42.7 44.4 29.4 41.0 38.3 1806 39.0 29.6 32.7 27.7 26.4 25.6 30.0 26.3 24.0 27.0 25.0 24.0 1807 12.0 12.2 9.6 23.8 10.0 12.0 12.7 12.0 5.7 8.0 2.6 0.0 1808 0.0 4.5 0.0 12.3 13.5 13.5 6.7 8.0 11.7 4.7 10.5 12.3 1809 7.2 9.2 0.9 2.5 2.0 7.7 0.3 0.2 0.4 0.0 0.0 0.0 1810 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1811 0.0 0.0 0.0 0.0 0.0 0.0 6.6 0.0 2.4 6.1 0.8 1.1 1812 11.3 1.9 0.7 0.0 1.0 1.3 0.5 15.6 5.2 3.9 7.9 10.1 1813 0.0 10.3 1.9 16.6 5.5 11.2 18.3 8.4 15.3 27.8 16.7 14.3 1814 22.2 12.0 5.7 23.8 5.8 14.9 18.5 2.3 8.1 19.3 14.5 20.1 1815 19.2 32.2 26.2 31.6 9.8 55.9 35.5 47.2 31.5 33.5 37.2 65.0 1816 26.3 68.8 73.7 58.8 44.3 43.6 38.8 23.2 47.8 56.4 38.1 29.9 1817 36.4 57.9 96.2 26.4 21.2 40.0 50.0 45.0 36.7 25.6 28.9 28.4 1818 34.9 22.4 25.4 34.5 53.1 36.4 28.0 31.5 26.1 31.6 10.9 25.8 1819 32.8 20.7 3.7 20.2 19.6 35.0 31.4 26.1 14.9 27.5 25.1 30.6 1820 19.2 26.6 4.5 19.4 29.3 10.8 20.6 25.9 5.2 8.9 7.9 9.1 1821 21.5 4.2 5.7 9.2 1.7 1.8 2.5 4.8 4.4 18.8 4.4 0.2 1822 0.0 0.9 16.1 13.5 1.5 5.6 7.9 2.1 0.0 0.4 0.0 0.0 1823 0.0 0.0 0.6 0.0 0.0 0.0 0.5 0.0 0.0 0.0 0.0 20.4 1824 21.7 10.8 0.0 19.4 2.8 0.0 0.0 1.4 20.5 25.2 0.0 0.8 1825 5.0 15.5 22.4 3.8 15.5 15.4 30.9 25.7 15.7 15.6 11.7 22.0 1826 17.7 18.2 36.7 24.0 32.4 37.1 52.5 39.6 18.9 50.6 39.5 68.1 1827 34.6 47.4 57.8 46.0 56.3 56.7 42.3 53.7 49.6 56.1 48.2 46.1 1828 52.8 64.4 65.0 61.1 89.1 98.0 54.2 76.4 50.4 54.7 57.0 46.9 1829 43.0 49.4 72.3 95.0 67.4 73.9 90.8 77.6 52.8 57.2 67.6 56.5 1830 52.2 72.1 84.6 106.3 66.3 65.1 43.9 50.7 62.1 84.4 81.2 82.1 1831 47.5 50.1 93.4 54.5 38.1 33.4 45.2 55.0 37.9 46.3 43.5 28.9 1832 30.9 55.6 55.1 26.9 41.3 26.7 14.0 8.9 8.2 21.1 14.3 27.5 1833 11.3 14.9 11.8 2.8 12.9 1.0 7.0 5.7 11.6 7.5 5.9 9.9 1834 4.9 18.1 3.9 1.4 8.8 7.8 8.7 4.0 11.5 24.8 30.5 34.5 1835 7.5 24.5 19.7 61.5 43.6 33.2 59.8 59.0 100.8 95.2 100.0 77.5 1836 88.6 107.6 98.2 142.9 111.4 124.7 116.7 107.8 95.1 137.4 120.9 206.2 1837 188.0 175.6 134.6 138.2 111.7 158.0 162.8 134.0 96.3 123.7 107.0 129.8 1838 144.9 84.8 140.8 126.6 137.6 94.5 108.2 78.8 73.6 90.8 77.4 79.8 1839 105.6 102.5 77.7 61.8 53.8 54.6 84.8 131.2 132.7 90.9 68.8 63.7 1840 81.2 87.7 67.8 65.9 69.2 48.5 60.7 57.8 74.0 55.0 54.3 53.7 1841 24.1 29.9 29.7 40.2 67.5 55.7 30.8 39.3 36.5 28.5 19.8 38.8 1842 20.4 22.1 21.7 26.9 24.9 20.5 12.6 26.6 18.4 38.1 40.5 17.6 1843 13.3 3.5 8.3 9.5 21.1 10.5 9.5 11.8 4.2 5.3 19.1 12.7 1844 9.4 14.7 13.6 20.8 11.6 3.7 21.2 23.9 7.0 21.5 10.7 21.6 1845 25.7 43.6 43.3 57.0 47.8 31.1 30.6 32.3 29.6 40.7 39.4 59.7 1846 38.7 51.0 63.9 69.3 59.9 65.1 46.5 54.8 107.1 55.9 60.4 65.5 1847 62.6 44.9 85.7 44.7 75.4 85.3 52.2 140.6 160.9 180.4 138.9 109.6 1848 159.1 111.8 108.6 107.1 102.2 129.0 139.2 132.6 100.3 132.4 114.6 159.5 1849 157.0 131.7 96.2 102.5 80.6 81.1 78.0 67.7 93.7 71.5 99.0 97.0 1850 78.0 89.4 82.6 44.1 61.6 70.0 39.1 61.6 86.2 71.0 54.8 61.0 1851 75.5 105.4 64.6 56.5 62.6 63.2 36.1 57.4 67.9 62.5 51.0 71.4 1852 68.4 66.4 61.2 65.4 54.9 46.9 42.1 39.7 37.5 67.3 54.3 45.4 1853 41.1 42.9 37.7 47.6 34.7 40.0 45.9 50.4 33.5 42.3 28.8 23.4 1854 15.4 20.0 20.7 26.5 24.0 21.1 18.7 15.8 22.4 12.6 28.2 21.6 1855 12.3 11.4 17.4 4.4 9.1 5.3 0.4 3.1 0.0 9.6 4.2 3.1 1856 0.5 4.9 0.4 6.5 0.0 5.2 4.6 5.9 4.4 4.5 7.7 7.2 1857 13.7 7.4 5.2 11.1 28.6 16.0 22.2 16.9 42.4 40.6 31.4 37.2 1858 39.0 34.9 57.5 38.3 41.4 44.5 56.7 55.3 80.1 91.2 51.9 66.9 1859 83.7 87.6 90.3 85.7 91.0 87.1 95.2 106.8 105.8 114.6 97.2 81.0 1860 82.4 88.3 98.9 71.4 107.1 108.6 116.7 100.3 92.2 90.1 97.9 95.6 1861 62.3 77.7 101.0 98.5 56.8 88.1 78.0 82.5 79.9 67.2 53.7 80.5 1862 63.1 64.5 43.6 53.7 64.4 84.0 73.4 62.5 66.6 41.9 50.6 40.9 1863 48.3 56.7 66.4 40.6 53.8 40.8 32.7 48.1 22.0 39.9 37.7 41.2 1864 57.7 47.1 66.3 35.8 40.6 57.8 54.7 54.8 28.5 33.9 57.6 28.6 1865 48.7 39.3 39.5 29.4 34.5 33.6 26.8 37.8 21.6 17.1 24.6 12.8 1866 31.6 38.4 24.6 17.6 12.9 16.5 9.3 12.7 7.3 14.1 9.0 1.5 1867 0.0 0.7 9.2 5.1 2.9 1.5 5.0 4.8 9.8 13.5 9.6 25.2 1868 15.6 15.7 26.5 36.6 26.7 31.1 29.0 34.4 47.2 61.6 59.1 67.6 1869 60.9 59.9 52.7 41.0 103.9 108.4 59.2 79.6 80.6 59.3 78.1 104.3 1870 77.3 114.9 157.6 160.0 176.0 135.6 132.4 153.8 136.0 146.4 147.5 130.0 1871 88.3 125.3 143.2 162.4 145.5 91.7 103.0 110.1 80.3 89.0 105.4 90.4 1872 79.5 120.1 88.4 102.1 107.6 109.9 105.5 92.9 114.6 102.6 112.0 83.9 1873 86.7 107.0 98.3 76.2 47.9 44.8 66.9 68.2 47.1 47.1 55.4 49.2 1874 60.8 64.2 46.4 32.0 44.6 38.2 67.8 61.3 28.0 34.3 28.9 29.3 1875 14.6 21.5 33.8 29.1 11.5 23.9 12.5 14.6 2.4 12.7 17.7 9.9 1876 14.3 15.0 30.6 2.3 5.1 1.6 15.2 8.8 9.9 14.3 9.9 8.2 1877 24.4 8.7 11.9 15.8 21.6 14.2 6.0 6.3 16.9 6.7 14.2 2.2 1878 3.3 6.6 7.8 0.1 5.9 6.4 0.1 0.0 5.3 1.1 4.1 0.5 1879 1.0 0.6 0.0 6.2 2.4 4.8 7.5 10.7 6.1 12.3 13.1 7.3 1880 24.0 27.2 19.3 19.5 23.5 34.1 21.9 48.1 66.0 43.0 30.7 29.6 1881 36.4 53.2 51.5 51.6 43.5 60.5 76.9 58.4 53.2 64.4 54.8 47.3 1882 45.0 69.5 66.8 95.8 64.1 45.2 45.4 40.4 57.7 59.2 84.4 41.8 1883 60.6 46.9 42.8 82.1 31.5 76.3 80.6 46.0 52.6 83.8 84.5 75.9 1884 91.5 86.9 87.5 76.1 66.5 51.2 53.1 55.8 61.9 47.8 36.6 47.2 1885 42.8 71.8 49.8 55.0 73.0 83.7 66.5 50.0 39.6 38.7 30.9 21.7 1886 29.9 25.9 57.3 43.7 30.7 27.1 30.3 16.9 21.4 8.6 0.3 13.0 1887 10.3 13.2 4.2 6.9 20.0 15.7 23.3 21.4 7.4 6.6 6.9 20.7 1888 12.7 7.1 7.8 5.1 7.0 7.1 3.1 2.8 8.8 2.1 10.7 6.7 1889 0.8 8.5 6.7 4.3 2.4 6.4 9.4 20.6 6.5 2.1 0.2 6.7 1890 5.3 0.6 5.1 1.6 4.8 1.3 11.6 8.5 17.2 11.2 9.6 7.8 1891 13.5 22.2 10.4 20.5 41.1 48.3 58.8 33.0 53.8 51.5 41.9 32.5 1892 69.1 75.6 49.9 69.6 79.6 76.3 76.5 101.4 62.8 70.5 65.4 78.6 1893 75.0 73.0 65.7 88.1 84.7 89.9 88.6 129.2 77.9 80.0 75.1 93.8 1894 83.2 84.6 52.3 81.6 101.2 98.9 106.0 70.3 65.9 75.5 56.6 60.0 1895 63.3 67.2 61.0 76.9 67.5 71.5 47.8 68.9 57.7 67.9 47.2 70.7 1896 29.0 57.4 52.0 43.8 27.7 49.0 45.0 27.2 61.3 28.7 38.0 42.6 1897 40.6 29.4 29.1 31.0 20.0 11.3 27.6 21.8 48.1 14.3 8.4 33.3 1898 30.2 36.4 38.3 14.5 25.8 22.3 9.0 31.4 34.8 34.4 30.9 12.6 1899 19.5 9.2 18.1 14.2 7.7 20.5 13.5 2.9 8.4 13.0 7.8 10.5 1900 9.4 13.6 8.6 16.0 15.2 12.1 8.3 4.3 8.3 12.9 4.5 0.3 1901 0.2 2.4 4.5 0.0 10.2 5.8 0.7 1.0 0.6 3.7 3.8 0.0 1902 5.5 0.0 12.4 0.0 2.8 1.4 0.9 2.3 7.6 16.3 10.3 1.1 1903 8.3 17.0 13.5 26.1 14.6 16.3 27.9 28.8 11.1 38.9 44.5 45.6 1904 31.6 24.5 37.2 43.0 39.5 41.9 50.6 58.2 30.1 54.2 38.0 54.6 1905 54.8 85.8 56.5 39.3 48.0 49.0 73.0 58.8 55.0 78.7 107.2 55.5 1906 45.5 31.3 64.5 55.3 57.7 63.2 103.6 47.7 56.1 17.8 38.9 64.7 1907 76.4 108.2 60.7 52.6 42.9 40.4 49.7 54.3 85.0 65.4 61.5 47.3 1908 39.2 33.9 28.7 57.6 40.8 48.1 39.5 90.5 86.9 32.3 45.5 39.5 1909 56.7 46.6 66.3 32.3 36.0 22.6 35.8 23.1 38.8 58.4 55.8 54.2 1910 26.4 31.5 21.4 8.4 22.2 12.3 14.1 11.5 26.2 38.3 4.9 5.8 1911 3.4 9.0 7.8 16.5 9.0 2.2 3.5 4.0 4.0 2.6 4.2 2.2 1912 0.3 0.0 4.9 4.5 4.4 4.1 3.0 0.3 9.5 4.6 1.1 6.4 1913 2.3 2.9 0.5 0.9 0.0 0.0 1.7 0.2 1.2 3.1 0.7 3.8 1914 2.8 2.6 3.1 17.3 5.2 11.4 5.4 7.7 12.7 8.2 16.4 22.3 1915 23.0 42.3 38.8 41.3 33.0 68.8 71.6 69.6 49.5 53.5 42.5 34.5 1916 45.3 55.4 67.0 71.8 74.5 67.7 53.5 35.2 45.1 50.7 65.6 53.0 1917 74.7 71.9 94.8 74.7 114.1 114.9 119.8 154.5 129.4 72.2 96.4 129.3 1918 96.0 65.3 72.2 80.5 76.7 59.4 107.6 101.7 79.9 85.0 83.4 59.2 1919 48.1 79.5 66.5 51.8 88.1 111.2 64.7 69.0 54.7 52.8 42.0 34.9 1920 51.1 53.9 70.2 14.8 33.3 38.7 27.5 19.2 36.3 49.6 27.2 29.9 1921 31.5 28.3 26.7 32.4 22.2 33.7 41.9 22.8 17.8 18.2 17.8 20.3 1922 11.8 26.4 54.7 11.0 8.0 5.8 10.9 6.5 4.7 6.2 7.4 17.5 1923 4.5 1.5 3.3 6.1 3.2 9.1 3.5 0.5 13.2 11.6 10.0 2.8 1924 0.5 5.1 1.8 11.3 20.8 24.0 28.1 19.3 25.1 25.6 22.5 16.5 1925 5.5 23.2 18.0 31.7 42.8 47.5 38.5 37.9 60.2 69.2 58.6 98.6 1926 71.8 69.9 62.5 38.5 64.3 73.5 52.3 61.6 60.8 71.5 60.5 79.4 1927 81.6 93.0 69.6 93.5 79.1 59.1 54.9 53.8 68.4 63.1 67.2 45.2 1928 83.5 73.5 85.4 80.6 77.0 91.4 98.0 83.8 89.7 61.4 50.3 59.0 1929 68.9 62.8 50.2 52.8 58.2 71.9 70.2 65.8 34.4 54.0 81.1 108.0 1930 65.3 49.9 35.0 38.2 36.8 28.8 21.9 24.9 32.1 34.4 35.6 25.8 1931 14.6 43.1 30.0 31.2 24.6 15.3 17.4 13.0 19.0 10.0 18.7 17.8 1932 12.1 10.6 11.2 11.2 17.9 22.2 9.6 6.8 4.0 8.9 8.2 11.0 1933 12.3 22.2 10.1 2.9 3.2 5.2 2.8 0.2 5.1 3.0 0.6 0.3 1934 3.4 7.8 4.3 11.3 19.7 6.7 9.3 8.3 4.0 5.7 8.7 15.4 1935 18.6 20.5 23.1 12.2 27.3 45.7 33.9 30.1 42.1 53.2 64.2 61.5 1936 62.8 74.3 77.1 74.9 54.6 70.0 52.3 87.0 76.0 89.0 115.4 123.4 1937 132.5 128.5 83.9 109.3 116.7 130.3 145.1 137.7 100.7 124.9 74.4 88.8 1938 98.4 119.2 86.5 101.0 127.4 97.5 165.3 115.7 89.6 99.1 122.2 92.7 1939 80.3 77.4 64.6 109.1 118.3 101.0 97.6 105.8 112.6 88.1 68.1 42.1 1940 50.5 59.4 83.3 60.7 54.4 83.9 67.5 105.5 66.5 55.0 58.4 68.3 1941 45.6 44.5 46.4 32.8 29.5 59.8 66.9 60.0 65.9 46.3 38.4 33.7 1942 35.6 52.8 54.2 60.7 25.0 11.4 17.7 20.2 17.2 19.2 30.7 22.5 1943 12.4 28.9 27.4 26.1 14.1 7.6 13.2 19.4 10.0 7.8 10.2 18.8 1944 3.7 0.5 11.0 0.3 2.5 5.0 5.0 16.7 14.3 16.9 10.8 28.4 1945 18.5 12.7 21.5 32.0 30.6 36.2 42.6 25.9 34.9 68.8 46.0 27.4 1946 47.6 86.2 76.6 75.7 84.9 73.5 116.2 107.2 94.4 102.3 123.8 121.7 1947 115.7 133.4 129.8 149.8 201.3 163.9 157.9 188.8 169.4 163.6 128.0 116.5 1948 108.5 86.1 94.8 189.7 174.0 167.8 142.2 157.9 143.3 136.3 95.8 138.0 1949 119.1 182.3 157.5 147.0 106.2 121.7 125.8 123.8 145.3 131.6 143.5 117.6 1950 101.6 94.8 109.7 113.4 106.2 83.6 91.0 85.2 51.3 61.4 54.8 54.1 1951 59.9 59.9 55.9 92.9 108.5 100.6 61.5 61.0 83.1 51.6 52.4 45.8 1952 40.7 22.7 22.0 29.1 23.4 36.4 39.3 54.9 28.2 23.8 22.1 34.3 1953 26.5 3.9 10.0 27.8 12.5 21.8 8.6 23.5 19.3 8.2 1.6 2.5 1954 0.2 0.5 10.9 1.8 0.8 0.2 4.8 8.4 1.5 7.0 9.2 7.6 1955 23.1 20.8 4.9 11.3 28.9 31.7 26.7 40.7 42.7 58.5 89.2 76.9 1956 73.6 124.0 118.4 110.7 136.6 116.6 129.1 169.6 173.2 155.3 201.3 192.1 1957 165.0 130.2 157.4 175.2 164.6 200.7 187.2 158.0 235.8 253.8 210.9 239.4 1958 202.5 164.9 190.7 196.0 175.3 171.5 191.4 200.2 201.2 181.5 152.3 187.6 1959 217.4 143.1 185.7 163.3 172.0 168.7 149.6 199.6 145.2 111.4 124.0 125.0 1960 146.3 106.0 102.2 122.0 119.6 110.2 121.7 134.1 127.2 82.8 89.6 85.6 1961 57.9 46.1 53.0 61.4 51.0 77.4 70.2 55.8 63.6 37.7 32.6 39.9 1962 38.7 50.3 45.6 46.4 43.7 42.0 21.8 21.8 51.3 39.5 26.9 23.2 1963 19.8 24.4 17.1 29.3 43.0 35.9 19.6 33.2 38.8 35.3 23.4 14.9 1964 15.3 17.7 16.5 8.6 9.5 9.1 3.1 9.3 4.7 6.1 7.4 15.1 1965 17.5 14.2 11.7 6.8 24.1 15.9 11.9 8.9 16.8 20.1 15.8 17.0 1966 28.2 24.4 25.3 48.7 45.3 47.7 56.7 51.2 50.2 57.2 57.2 70.4 1967 110.9 93.6 111.8 69.5 86.5 67.3 91.5 107.2 76.8 88.2 94.3 126.4 1968 121.8 111.9 92.2 81.2 127.2 110.3 96.1 109.3 117.2 107.7 86.0 109.8 1969 104.4 120.5 135.8 106.8 120.0 106.0 96.8 98.0 91.3 95.7 93.5 97.9 1970 111.5 127.8 102.9 109.5 127.5 106.8 112.5 93.0 99.5 86.6 95.2 83.5 1971 91.3 79.0 60.7 71.8 57.5 49.8 81.0 61.4 50.2 51.7 63.2 82.2 1972 61.5 88.4 80.1 63.2 80.5 88.0 76.5 76.8 64.0 61.3 41.6 45.3 1973 43.4 42.9 46.0 57.7 42.4 37.5 23.1 25.6 59.3 30.7 23.9 23.3 1974 27.6 26.0 21.3 40.3 39.5 36.0 55.8 33.6 40.2 47.1 25.0 20.5 1975 18.9 11.5 11.5 5.1 9.0 11.4 28.2 39.7 13.9 9.1 19.4 7.8 1976 8.1 4.3 21.9 18.8 12.4 12.2 1.9 16.4 13.5 20.6 5.2 15.3 1977 16.4 23.1 8.7 12.9 18.6 38.5 21.4 30.1 44.0 43.8 29.1 43.2 1978 51.9 93.6 76.5 99.7 82.7 95.1 70.4 58.1 138.2 125.1 97.9 122.7 1979 166.6 137.5 138.0 101.5 134.4 149.5 159.4 142.2 188.4 186.2 183.3 176.3 1980 159.6 155.0 126.2 164.1 179.9 157.3 136.3 135.4 155.0 164.7 147.9 174.4 1981 114.0 141.3 135.5 156.4 127.5 90.9 143.8 158.7 167.3 162.4 137.5 150.1 1982 111.2 163.6 153.8 122.0 82.2 110.4 106.1 107.6 118.8 94.7 98.1 127.0 1983 84.3 51.0 66.5 80.7 99.2 91.1 82.2 71.8 50.3 55.8 33.3 33.4 1984 57.0 85.4 83.5 69.7 76.4 46.1 37.4 25.5 15.7 12.0 22.8 18.7 1985 16.5 15.9 17.2 16.2 27.5 24.2 30.7 11.1 3.9 18.6 16.2 17.3 1986 2.5 23.2 15.1 18.5 13.7 1.1 18.1 7.4 3.8 35.4 15.2 6.8 1987 10.4 2.4 14.7 39.6 33.0 17.4 33.0 38.7 33.9 60.6 39.9 27.1 1988 59.0 40.0 76.2 88.0 60.1 101.8 113.8 111.6 120.1 125.1 125.1 179.2 1989 161.3 165.1 131.4 130.6 138.5 196.2 126.9 168.9 176.7 159.4 173.0 165.5 1990 177.3 130.5 140.3 140.3 132.2 105.4 149.4 200.3 125.2 145.5 131.4 129.7 1991 136.9 167.5 141.9 140.0 121.3 169.7 173.7 176.3 125.3 144.1 108.2 144.4 1992 150.0 161.1 106.7 99.8 73.8 65.2 85.7 64.5 63.9 88.7 91.8 82.6 1993 59.3 91.0 69.8 62.2 61.3 49.8 57.9 42.2 22.4 56.4 35.6 48.9 1994 57.8 35.5 31.7 16.1 17.8 28.0 35.1 22.5 25.7 44.0 18.0 26.2 1995 24.2 29.9 31.1 14.0 14.5 15.6 14.5 14.3 11.8 21.1 9.0 10.0 1996 11.5 4.4 9.2 4.8 5.5 11.8 8.2 14.4 1.6 0.9 17.9 13.3 1997 5.7 7.6 8.7 15.5 18.5 12.7 10.4 24.4 51.3 23.8 39.0 41.2 1998 31.9 40.3 54.8 53.4 56.3 70.7 66.6 92.2 92.9 55.5 74.0 81.9 1999 62.0 66.3 68.8 63.7 106.4 137.7 113.5 93.7 71.5 116.7 133.2 84.6 2000 90.1 112.9 138.5 125.5 121.6 124.9 170.1 130.5 109.7 99.4 106.8 104.4 2001 95.6 80.6 113.5 107.7 96.6 134.0 81.8 106.4 150.7 125.5 106.5 132.2 2002 114.1 107.4 98.4 120.7 120.8 88.3 99.6 116.4 109.6 97.5 95.5 80.8 2003 79.7 46.0 61.1 60.0 54.6 77.4 83.3 72.7 48.7 65.5 67.3 46.5 2004 37.3 45.8 49.1 39.3 41.5 43.2 51.1 40.9 27.7 48.0 43.5 17.9 2005 31.3 29.2 24.5 24.2 42.7 39.3 40.1 36.4 21.9 8.7 18.0 41.1 2006 15.3 4.9 10.6 30.2 22.3 13.9 12.2 12.9 14.4 10.5 21.4 13.6 2007 16.8 10.7 4.5 3.4 11.7 12.1 9.7 6.0 2.4 0.9 1.7 10.1 2008 3.3 2.1 9.3 2.9 3.2 3.4 0.8 0.5 1.1 2.9 4.1 0.8 2009 1.3 1.4 0.7 0.8 2.9 2.9 3.2 0.0 4.3 4.8 4.1 10.8 2010 13.2 18.8 15.4 8.0 8.7 13.6 16.1 19.6 25.2 23.5 21.5 14.4 2011 18.8 29.6 55.8 54.4 41.5 37.0 43.9 50.6 78.0 88.0 ------------------------------------------------------------------------------- No observations were available during February 1824. The value shown was interpolated from the January and March monthly means of that year. Note: Data are preliminary after Jun 2010.