Year Years 1800 435.8 1801 435.8 1802 435.8 1803 435.8 1804 435.8 1805 435.8 1806 435.8 1807 435.8 1808 435.8 1809 435.8 1810 435.8 1811 435.8 1812 435.8 1813 435.8 1814 435.8 1815 435.8 1816 435.8 1817 435.8 1818 435.8 1819 435.8 1820 435.8 1821 435.8 1822 435.8 1823 435.8 1824 435.8 1825 435.8 1826 435.8 1827 435.8 1828 435.8 1829 435.8 1830 435.8 1831 435.8 1832 435.8 1833 435.8 1834 435.8 1835 435.8 1836 435.8 1837 435.8 1838 435.8 1839 435.8 1840 435.8 1841 435.8 1842 435.8 1843 435.8 1844 435.8 1845 435.8 1846 435.8 1847 435.8 1848 435.8 1849 435.8 1850 435.8 1851 435.8 1852 435.8 1853 435.8 1854 435.8 1855 435.8 1856 435.8 1857 435.8 1858 435.8 1859 435.8 1860 435.8 1861 435.8 1862 435.8 1863 435.8 1864 435.8 1865 435.8 1866 435.8 1867 435.8 1868 435.8 1869 435.8 1870 435.8 1871 435.8 1872 435.8 1873 435.8 1874 435.8 1875 435.8 1876 435.8 1877 435.8 1878 435.8 1879 435.8 1880 435.8 1881 435.8 1882 435.8 1883 435.8 1884 435.8 1885 435.8 1886 435.8 1887 435.8 1888 435.8 1889 435.8 1890 435.8 1891 435.8 1892 435.8 1893 435.8 1894 435.8 1895 435.8 1896 435.7 1897 435.6 1898 435.4 1899 435.2 1900 434.9 1901 434.5 1902 434 1903 433.5 1904 432.9 1905 432.3 1906 431.6 1907 430.8 1908 429.9 1909 429 1910 428.1 1911 427.1 1912 426.1 1913 425.1 1914 424 1915 423 1916 422 1917 421 1918 419.9 1919 418.9 1920 417.9 1921 416.9 1922 415.9 1923 414.8 1924 413.8 1925 412.8 1926 411.8 1927 410.7 1928 409.7 1929 408.7 1930 407.7 1931 393.2 1932 377.9 1933 364.1 1934 349.7 1935 336.7 1936 323 1937 310.6 1938 297.6 1939 285.8 1940 274.4 1941 262.3 1942 251.4 1943 239.8 1944 229.4 1945 218.4 1946 208.5 1956 116.4 1957 110 1958 103.9 1959 98.2 1960 92.7 1961 87.6 1962 83 1963 78.6 1964 74.5 1965 70.7 1966 67.3 1967 64.2 1968 61.2 1969 58.5 1970 55.8 1971 53.1 1972 50.4 1973 47.8 1974 45.1 1975 42.5 1976 39.9 1977 37.3 1978 34.9 1979 32.6 1980 30.5 1981 28.4 1982 26.5 1983 24.8 1984 23.2 1985 21.8 1986 20.5 1987 19.4 1988 18.4 1989 17.4 1990 16.6 1991 15.8 1992 15.1 1993 14.4 1994 13.9 1995 13.3 1996 12.9 1997 12.4 1998 11.8 1999 11 2000 10.1 2001 9.5 2002 8.9 2003 8.5 2004 8.3 2005 8.2 2006 8.1 2007 8.1 2008 8.2 2009 8.3 2010 8.5 2011 8.5 2012 8.5 2013 8.5