Year Years 1800 501.9 1801 501.9 1802 501.9 1803 501.9 1804 501.9 1805 501.9 1806 501.9 1807 501.9 1808 501.9 1809 501.9 1810 501.9 1811 501.9 1812 501.9 1813 501.9 1814 501.9 1815 501.9 1816 501.9 1817 501.9 1818 501.9 1819 501.9 1820 501.9 1821 501.9 1822 501.9 1823 501.9 1824 501.9 1825 501.9 1826 501.9 1827 501.9 1828 501.9 1829 501.9 1830 501.9 1831 501.9 1832 501.9 1833 501.9 1834 501.9 1835 501.9 1836 501.9 1837 501.9 1838 501.9 1839 501.9 1840 501.9 1841 501.9 1842 501.9 1843 501.9 1844 501.9 1845 501.9 1846 501.9 1847 501.9 1848 501.9 1849 501.9 1850 501.9 1851 501.9 1852 501.9 1853 501.9 1854 501.9 1855 501.9 1856 501.9 1857 501.9 1858 501.9 1859 501.9 1860 501.9 1861 501.9 1862 501.9 1863 501.9 1864 501.9 1865 501.9 1866 501.9 1867 501.9 1868 501.9 1869 501.9 1870 501.9 1871 501.9 1872 501.9 1873 501.9 1874 501.9 1875 501.9 1876 501.9 1877 501.9 1878 501.9 1879 501.9 1880 501.9 1881 501.9 1882 501.9 1883 501.9 1884 501.9 1885 501.9 1886 501.9 1887 501.9 1888 501.9 1889 501.9 1890 501.9 1891 501.9 1892 501.9 1893 501.9 1894 501.8 1895 501.8 1896 501.7 1897 501.6 1898 501.4 1899 501.1 1900 500.8 1901 500.3 1902 499.8 1903 499.2 1904 498.6 1905 497.8 1906 497 1907 496.1 1908 495.1 1909 494.1 1910 493 1911 491.8 1912 490.7 1913 489.5 1914 488.3 1915 487.1 1916 486 1917 502.4 1918 517.7 1919 535.1 1920 551.4 1921 570 1922 556.9 1923 544.1 1924 533.2 1925 521 1926 510.6 1927 498.9 1928 487.5 1929 477.7 1930 466.7 1931 455.9 1932 448.1 1933 440.3 1934 432.6 1935 425.1 1936 417.7 1937 410.4 1938 403.1 1939 396 1940 389 1950 388.2 1951 371.6 1952 355.4 1953 339.9 1954 325.6 1955 311.8 1956 298.8 1957 286.5 1958 275 1959 264.1 1960 253.9 1961 244.6 1962 235.6 1963 227.4 1964 219.8 1965 213 1966 206.8 1967 201.3 1968 196.3 1969 191.8 1970 187.8 1971 184 1972 180.6 1973 177.5 1974 174.7 1975 172.1 1976 169.7 1977 167.5 1978 165.4 1979 163.4 1980 161.5 1981 159.5 1982 157.5 1983 155.4 1984 153.2 1985 150.8 1986 148.4 1987 146 1988 143.5 1989 141.1 1990 138.6 1991 136.1 1992 133.6 1993 131 1994 128.5 1995 125.9 1996 123.2 1997 120.5 1998 117.8 1999 115.2 2000 112.6 2001 110.1 2002 107.8 2003 105.5 2004 103.4 2005 101.4 2006 99.4 2007 97.5 2008 95.6 2009 93.6 2010 91.8 2011 89.9 2012 87.8 2013 85.5