Year Years 1800 503.4 1801 503.4 1802 503.4 1803 503.4 1804 503.4 1805 503.4 1806 503.4 1807 503.4 1808 503.4 1809 503.4 1810 503.4 1811 503.4 1812 503.4 1813 503.4 1814 503.4 1815 503.4 1816 503.4 1817 503.4 1818 503.4 1819 503.4 1820 503.4 1821 503.4 1822 503.4 1823 503.4 1824 503.4 1825 503.4 1826 503.4 1827 503.4 1828 503.4 1829 503.4 1830 503.4 1831 503.4 1832 503.4 1833 503.4 1834 503.4 1835 503.4 1836 503.4 1837 503.4 1838 503.4 1839 503.4 1840 503.4 1841 503.4 1842 503.4 1843 503.4 1844 503.4 1845 503.4 1846 503.4 1847 503.4 1848 503.4 1849 503.4 1850 503.4 1851 503.4 1852 503.4 1853 503.4 1854 503.4 1855 503.4 1856 503.4 1857 503.4 1858 503.4 1859 503.4 1860 503.4 1861 503.4 1862 503.4 1863 503.4 1864 503.4 1865 503.4 1866 503.4 1867 503.4 1868 503.4 1869 503.4 1870 503.4 1871 503.4 1872 503.4 1873 503.4 1874 503.4 1875 503.4 1876 503.4 1877 503.4 1878 503.4 1879 503.4 1880 503.4 1881 503.4 1882 503.4 1883 503.4 1884 503.4 1885 503.4 1886 503.4 1887 503.4 1888 503.4 1889 503.4 1890 503.4 1891 503.4 1892 503.4 1893 503.4 1894 503.4 1895 503.3 1896 503.2 1897 503.1 1898 502.9 1899 502.6 1900 502.3 1901 501.8 1902 501.3 1903 500.7 1904 500.1 1905 499.3 1906 498.5 1907 497.6 1908 496.6 1909 495.6 1910 494.4 1911 493.3 1912 492.1 1913 491 1914 489.8 1915 488.6 1916 487.4 1917 486.2 1918 485.1 1919 483.9 1920 482.7 1921 481.5 1922 480.3 1923 479.1 1924 478 1925 476.8 1926 475.6 1927 474.4 1928 473.2 1929 472.1 1930 470.9 1931 469.7 1932 468.5 1933 467.3 1934 466.1 1935 454.1 1936 443.6 1937 431.9 1938 421.9 1939 410.8 1940 399.9 1941 385.6 1942 371.8 1943 358.3 1944 345.2 1945 332.4 1946 319.9 1947 307.8 1957 237 1958 231.9 1959 226.7 1960 221.8 1961 217 1962 212.3 1963 207.7 1964 203.2 1965 198.7 1966 194.1 1967 189.4 1968 184.5 1969 179.5 1970 174.2 1971 168.8 1972 163.5 1973 158.3 1974 153.1 1975 148 1976 143 1977 138.1 1978 133.3 1979 128.5 1980 123.8 1981 119.2 1982 114.6 1983 110.1 1984 105.7 1985 101.3 1986 97 1987 92.7 1988 88.6 1989 84.5 1990 80.6 1991 76.8 1992 73.1 1993 69.6 1994 66.3 1995 63.2 1996 60.4 1997 57.7 1998 55.2 1999 52.9 2000 50.7 2001 48.7 2002 46.7 2003 44.9 2004 43.1 2005 41.4 2006 39.8 2007 38.2 2008 36.9 2009 35.7 2010 34.5 2011 33.2 2012 32.1 2013 31