Year Years
1800 333.5
1801 333.5
1802 333.5
1803 333.5
1804 333.5
1805 333.5
1806 333.5
1807 333.5
1808 333.5
1809 333.5
1810 333.5
1811 333.5
1812 333.5
1813 333.5
1814 333.5
1815 333.5
1816 333.5
1817 333.5
1818 333.5
1819 333.5
1820 333.5
1821 333.5
1822 333.5
1823 333.5
1824 333.5
1825 333.5
1826 333.5
1827 333.5
1828 333.5
1829 333.5
1830 333.5
1831 333.5
1832 331.3
1833 330.1
1834 329
1835 326.8
1836 325.7
1837 324.6
1838 323.5
1839 321.3
1840 320.2
1841 319.1
1842 318
1843 317
1844 317
1845 315.9
1846 314.8
1847 313.7
1848 313.7
1849 312.6
1850 311.5
1851 310.4
1852 310.4
1853 309.4
1854 309.4
1855 308.3
1856 308.3
1857 307.2
1858 307.2
1859 306.2
1860 306.2
1861 305.1
1862 304.1
1863 303
1864 301.9
1865 300.8
1866 299.8
1867 298.8
1868 297.7
1869 296.6
1870 295.6
1871 294.6
1872 292.5
1873 290.4
1874 288.3
1875 286.2
1876 284.2
1877 281.1
1878 279.1
1879 277
1880 275
1881 273
1882 272
1883 272
1884 271
1885 271
1886 270
1887 270
1888 270
1889 269
1890 269
1900 304.1
1901 271.6
1902 216.6
1903 212.8
1904 167.8
1906 205.3
1908 339.9
1909 222.2
1910 282.7
1911 300.8
1912 261.9
1913 273.2
1914 261.9
1915 247.9
1916 268.4
1917 216.6
1918 220.3
1919 227.8
1920 265.2
1921 144.4
1922 143.9
1923 141.1
1924 127.1
1925 122.4
1926 132.6
1927 124.9
1928 120.7
1929 127.5
1930 124.7
1931 115.6
1932 98.78
1933 92.92
1934 91.88
1935 91.52
1936 86.19
1937 103.3
1938 86.44
1939 80.76
1940 77.79
1941 80.64
1942 73.13
1943 70.17
1944 68.69
1945 61.31
1946 61.25
1947 59.89
1948 53.92
1949 51.97
1950 48.7
1951 46.2
1952 43.9
1953 41.7
1954 39.9
1955 38.3
1956 37
1957 35.8
1958 34.7
1959 33.7
1960 32.6
1961 31.6
1962 30.5
1963 29.4
1964 28.2
1965 27.1
1966 26
1967 25
1968 24
1969 23
1970 22
1971 21
1972 19.9
1973 19
1974 18
1975 17
1976 16
1977 15.1
1978 14.2
1979 13.3
1980 12.5
1981 11.8
1982 11.2
1983 10.6
1984 10.1
1985 9.7
1986 9.4
1987 9.1
1988 8.8
1989 8.6
1990 8.3
1991 8
1992 7.7
1993 7.4
1994 7.2
1995 6.9
1996 6.7
1997 6.5
1998 6.4
1999 6.3
2000 6.2
2001 6.2
2002 6.2
2003 6.1
2004 6.1
2005 6.1
2006 6
2007 5.9
2008 5.8
2009 5.7
2010 5.6
2011 5.4
2012 5.3
2013 5.2