Year Years 1800 371.6 1801 371.6 1802 371.6 1803 371.6 1804 371.6 1805 371.6 1806 371.6 1807 371.6 1808 371.6 1809 371.6 1810 371.6 1811 371.6 1812 371.6 1813 371.6 1814 371.6 1815 371.6 1816 371.6 1817 371.6 1818 371.6 1819 371.6 1820 371.6 1821 371.6 1822 371.6 1823 371.6 1824 371.6 1825 371.6 1826 371.6 1827 371.6 1828 371.6 1829 371.6 1830 371.6 1831 371.6 1832 371.6 1833 371.6 1834 371.6 1835 371.6 1836 371.6 1837 371.6 1838 371.6 1839 371.6 1840 371.6 1841 371.6 1842 371.6 1843 371.6 1844 371.6 1845 371.6 1846 371.6 1847 371.6 1848 371.6 1849 371.6 1850 371.6 1851 371.6 1852 371.6 1853 371.6 1854 371.6 1855 371.6 1856 371.6 1857 371.6 1858 371.6 1859 371.6 1860 371.6 1861 371.6 1862 371.6 1863 371.6 1864 371.6 1865 371.6 1866 371.6 1867 371.6 1868 371.6 1869 371.6 1870 371.6 1871 371.6 1872 371.6 1873 371.6 1874 371.6 1875 371.6 1876 371.6 1877 371.6 1878 371.6 1879 371.6 1880 371.6 1881 371.6 1882 371.6 1883 371.6 1884 371.6 1885 371.6 1886 371.6 1887 371.6 1888 371.6 1889 371.6 1890 371.6 1891 371.6 1892 371.6 1893 371.6 1894 371.6 1895 371.6 1896 371.5 1897 371.4 1898 371.3 1899 371.1 1900 370.8 1901 370.5 1902 370.1 1903 369.7 1904 369.2 1905 368.6 1906 368 1907 367.3 1908 366.6 1909 365.8 1910 365 1911 364.2 1912 363.3 1913 362.4 1914 361.6 1915 360.7 1916 359.8 1917 359 1918 358.1 1919 357.2 1920 356.4 1921 355.5 1922 354.6 1923 353.7 1924 352.9 1925 352 1926 351.1 1927 350.2 1928 349.4 1929 348.5 1930 347.6 1931 346.8 1932 345.9 1933 345 1934 344.1 1935 343.3 1936 342.4 1937 341.5 1938 340.6 1939 339.8 1940 338.9 1941 330.5 1942 321.2 1952 308.9 1953 296.1 1954 283.8 1955 272.5 1956 262.1 1957 252.8 1958 244.4 1959 236.7 1960 229.5 1961 222.1 1962 214.6 1963 207.1 1964 199.8 1965 192.6 1966 185.8 1967 179.6 1968 173.9 1969 168.6 1970 163.6 1971 158.8 1972 154 1973 149.3 1974 144.7 1975 140.5 1976 136.7 1977 133.4 1978 130.4 1979 127.6 1980 124.8 1981 121.7 1982 118.1 1983 114 1984 109.4 1985 104.4 1986 99.2 1987 94 1988 89 1989 84.4 1990 80 1991 75.7 1992 71.3 1993 66.9 1994 62.5 1995 58.2 1996 54 1997 50.1 1998 46.3 1999 42.9 2000 39.8 2001 36.9 2002 34.3 2003 31.9 2004 29.7 2005 27.7 2006 25.8 2007 24 2008 22.4 2009 20.9 2010 19.6 2011 18.4 2012 17.5 2013 16.7