Year Years 1800 510.9 1801 510.9 1802 510.9 1803 510.9 1804 510.9 1805 510.9 1806 510.9 1807 510.9 1808 510.9 1809 510.9 1810 510.9 1811 510.9 1812 510.9 1813 510.9 1814 510.9 1815 510.9 1816 510.9 1817 510.9 1818 510.9 1819 510.9 1820 510.9 1821 510.9 1822 510.9 1823 510.9 1824 510.9 1825 510.9 1826 510.9 1827 510.9 1828 510.9 1829 510.9 1830 510.9 1831 510.9 1832 510.9 1833 510.9 1834 510.9 1835 510.9 1836 510.9 1837 510.9 1838 510.9 1839 510.9 1840 510.9 1841 510.9 1842 510.9 1843 510.9 1844 510.9 1845 510.9 1846 510.9 1847 510.9 1848 510.9 1849 510.9 1850 510.9 1851 510.9 1852 510.9 1853 510.9 1854 510.9 1855 510.9 1856 510.9 1857 510.9 1858 510.9 1859 510.9 1860 510.9 1861 510.9 1862 510.9 1863 510.9 1864 510.9 1865 510.9 1866 510.9 1867 510.9 1868 510.9 1869 510.9 1870 510.9 1871 510.9 1872 510.9 1873 510.9 1874 510.9 1875 510.9 1876 510.9 1877 510.9 1878 510.9 1879 510.9 1880 510.9 1881 510.9 1882 510.9 1883 510.9 1884 510.9 1885 510.9 1886 510.9 1887 510.9 1888 510.9 1889 510.9 1890 510.9 1891 510.9 1892 510.9 1893 510.9 1894 510.9 1895 510.8 1896 510.8 1897 510.6 1898 510.4 1899 510.1 1900 509.8 1901 509.4 1902 508.8 1903 508.2 1904 507.6 1905 506.8 1906 506 1907 505 1908 504 1909 503 1910 501.9 1911 500.7 1912 499.5 1913 498.3 1914 497.1 1915 495.9 1916 494.7 1917 493.5 1918 492.3 1919 491.1 1920 489.9 1921 488.7 1922 487.5 1923 490.6 1924 493.8 1925 495.5 1926 498.7 1927 501.9 1928 496.2 1929 492.1 1930 486.5 1931 482.4 1932 476.9 1933 472.9 1934 467.6 1935 463.6 1936 458.3 1937 454.4 1938 449.2 1939 444.1 1940 439 1941 434 1942 429 1943 424.1 1944 419.2 1953 266.6 1954 260.2 1955 253.8 1956 247.6 1957 241.8 1958 236.3 1959 231.1 1960 225.9 1961 220.8 1962 215.7 1963 211 1964 206 1965 201.1 1966 196.2 1967 192 1968 188.4 1969 185.7 1970 184.2 1971 183.9 1972 184.8 1973 186.8 1974 190.1 1975 194.1 1976 198.8 1977 203.9 1978 208.6 1979 212.2 1980 213.9 1981 212.8 1982 208.1 1983 201.3 1984 194.2 1985 188.4 1986 184.3 1987 182.2 1988 181.3 1989 180.4 1990 178.7 1991 176.2 1992 173.2 1993 170.1 1994 167.5 1995 165.4 1996 163.4 1997 160.9 1998 157.5 1999 152.9 2000 147 2001 140.1 2002 132.5 2003 124.5 2004 116.3 2005 108.5 2006 101.3 2007 94.7 2008 88.5 2009 83.1 2010 78.4 2011 73.9 2012 68.9 2013 66.1