Year Years 1751 299.8 1752 359.6 1753 303.4 1754 326.9 1755 345 1756 337.8 1757 356.3 1758 335.3 1759 285 1760 272.6 1761 315.6 1762 377 1763 395.3 1764 316.1 1765 316 1766 311.9 1767 298.5 1768 357.5 1769 358.5 1770 325.4 1771 323.4 1772 366.6 1773 489.7 1774 279.6 1775 305.9 1776 256.2 1777 302.1 1778 353.2 1779 394.2 1780 261.1 1781 300.4 1782 301 1783 344.6 1784 382.2 1785 344.6 1786 294.9 1787 270.4 1788 325.9 1789 343.8 1790 325.5 1791 286.2 1792 297.3 1793 299.8 1794 280.6 1795 314.5 1796 315.3 1797 294.1 1798 271.7 1799 289 1800 381.1 1801 328.8 1802 282.9 1803 275.3 1804 271.7 1805 265.9 1806 332.8 1807 278.3 1808 349.6 1809 365.9 1810 346 1811 324.6 1812 312.2 1813 303.6 1814 299.4 1815 274.6 1816 273.5 1817 276.1 1818 269.7 1819 293.6 1820 260.8 1821 305.1 1822 245 1823 217.6 1824 224.6 1825 227.9 1826 242.2 1827 226.3 1828 282.1 1829 303 1830 254.9 1831 275.9 1832 256 1833 244.4 1834 252.6 1835 200 1836 225 1837 279.7 1838 253.6 1839 251.6 1840 220.7 1841 220.8 1842 242.4 1843 232.7 1844 226.2 1845 214.8 1846 249.7 1847 270.1 1848 212.3 1849 227 1850 217.9 1851 232.3 1852 250.3 1853 257.4 1854 219.7 1855 226.2 1856 245.9 1857 309.9 1858 248 1859 232.1 1860 196.6 1861 216.8 1862 265.5 1863 236.7 1864 235.4 1865 232.9 1866 221.8 1867 210.6 1868 249.4 1869 271.4 1870 220.5 1871 183.5 1872 186.8 1873 197.4 1874 229.8 1875 232.5 1876 237.3 1877 227.8 1878 226.9 1879 196.9 1880 203.9 1881 194.9 1882 206.6 1883 197.3 1884 192.3 1885 195 1886 183.4 1887 173.4 1888 160.7 1889 162.5 1890 177.6 1891 178.9 1892 171 1893 166.8 1894 161.5 1895 147 1896 156.2 1897 148.6 1898 140.6 1899 171.7 1900 155.2 1901 157.1 1902 135.6 1903 138.6 1904 127.2 1905 131.8 1906 117.8 1907 112.2 1908 122.2 1909 103.4 1910 108.2 1911 104.2 1912 103.7 1913 97.59 1914 101.3 1915 105.3 1916 101.5 1917 93 1918 105.9 1919 104.8 1920 97.79 1921 84.64 1922 80.43 1923 73.84 1924 81.24 1925 73.36 1926 72.47 1927 78.46 1928 78.58 1929 73.24 1930 69.49 1931 71.45 1932 64.42 1933 60.97 1934 59.49 1935 58.18 1936 57.3 1937 58.46 1938 54.29 1939 49.72 1940 46.86 1941 47.23 1942 38.21 1943 38.15 1944 41.38 1945 38.17 1946 32.05 1947 30.53 1948 27.95 1949 27.59 1950 25.41 1951 25.74 1952 24.36 1953 22.69 1954 21.93 1955 21.33 1956 20.98 1957 21.16 1958 19.18 1959 19.64 1960 19.66 1961 18.93 1962 18.43 1963 18.18 1964 17.2 1965 15.76 1966 15 1967 14.69 1968 14.5 1969 13.44 1970 13.16 1971 13.02 1972 12.54 1973 11.37 1974 11.22 1975 10.02 1976 9.49 1977 9.37 1978 9.01 1979 9.18 1980 8.22 1981 7.8 1982 8.02 1983 7.99 1984 7.26 1985 8 1986 7.23 1987 7.33 1988 7.03 1989 6.91 1990 7.14 1991 7.08 1992 6.18 1993 5.62 1994 5.09 1995 4.59 1996 4.54 1997 4.35 1998 4.2 1999 3.83 2000 3.87 2001 4.36 2002 4.04 2003 3.85 2004 3.6 2005 3.24 2006 3.51 2007 3.14 2008 3.04 2009 3.23 2010 3.08 2011 2.8 2012 2.8 2013 2.8