Year Years 1800 458.8 1801 458.8 1802 458.8 1803 458.8 1804 458.8 1805 458.8 1806 458.8 1807 458.8 1808 458.8 1809 458.8 1810 458.8 1811 458.8 1812 458.8 1813 458.8 1814 458.8 1815 458.8 1816 458.8 1817 458.8 1818 458.8 1819 458.8 1820 458.8 1821 458.8 1822 458.8 1823 458.8 1824 458.8 1825 458.8 1826 458.8 1827 458.8 1828 458.8 1829 458.8 1830 458.8 1831 458.8 1832 458.8 1833 458.8 1834 458.8 1835 458.8 1836 458.8 1837 458.8 1838 458.8 1839 458.8 1840 458.8 1841 458.8 1842 458.8 1843 458.8 1844 458.8 1845 458.8 1846 458.8 1847 458.8 1848 458.8 1849 458.8 1850 458.8 1851 458.8 1852 458.8 1853 458.8 1854 458.8 1855 458.8 1856 458.8 1857 458.8 1858 458.8 1859 458.8 1860 458.8 1861 458.8 1862 458.8 1863 458.8 1864 458.8 1865 458.8 1866 458.8 1867 458.8 1868 458.8 1869 458.8 1870 458.8 1871 453.3 1872 446.5 1873 441.1 1874 435.8 1875 430.5 1876 423.9 1877 418.7 1878 413.6 1879 408.5 1880 402.2 1881 397.2 1882 392.2 1883 387.3 1884 381.2 1885 376.4 1886 371.6 1887 365.7 1888 361 1889 356.3 1890 351.7 1891 345.9 1892 341.4 1893 336.9 1894 332.4 1895 326.8 1896 322.3 1897 317.9 1898 313.4 1899 307.9 1900 303.4 1901 298.9 1902 295.4 1903 290.9 1904 287.4 1905 282.9 1906 279.4 1907 274.9 1908 271.3 1909 266.8 1910 263.2 1911 258.7 1912 255.2 1913 250.8 1914 247.3 1915 242.9 1916 239.6 1917 235.3 1918 231.9 1919 227.7 1920 224.5 1921 220.3 1922 217.2 1923 213.1 1924 209.9 1925 206 1926 201.2 1927 196.5 1928 191 1929 186.4 1930 181.8 1931 177.3 1932 172.1 1933 167.7 1934 163.4 1935 159.2 1936 155 1937 150.1 1938 146 1939 142 1940 138 1941 133.4 1942 129.6 1943 125.8 1944 122 1945 118.3 1946 114.1 1947 110.5 1948 107 1949 103.5 1959 66.83 1960 48.54 1961 45.3 1962 45.25 1963 43.42 1964 37.22 1965 32.28 1966 30.33 1967 29.9 1968 28.9 1969 27.4 1970 25.4 1971 23.5 1972 22.8 1973 23.5 1974 24.6 1975 25.1 1976 24.9 1977 24.4 1978 23.9 1979 23.3 1980 22.6 1981 21.8 1982 21.2 1983 20.6 1984 20 1985 19.1 1986 18 1987 16.8 1988 15.8 1989 15.5 1990 16.5 1991 18.4 1992 19.8 1993 19.7 1994 18.4 1995 16.6 1996 14.8 1997 13.5 1998 12.8 1999 12.3 2000 11.8 2001 11.3 2002 10.9 2003 10.5 2004 10.3 2005 9.9 2006 9.4 2007 8.8 2008 8.2 2009 7.4 2010 6.7 2011 6.1 2012 5.5 2013 4.9