Year Years 1800 429.2 1801 429.2 1802 429.2 1803 429.2 1804 429.2 1805 429.2 1806 429.2 1807 429.2 1808 429.2 1809 429.2 1810 429.2 1811 429.2 1812 429.2 1813 429.2 1814 429.2 1815 429.2 1816 429.2 1817 429.2 1818 429.2 1819 429.2 1820 429.2 1821 429.2 1822 429.2 1823 429.2 1824 429.2 1825 429.2 1826 429.2 1827 429.2 1828 429.2 1829 429.2 1830 429.2 1831 429.2 1832 429.2 1833 429.2 1834 429.2 1835 429.2 1836 429.2 1837 429.2 1838 429.2 1839 429.2 1840 429.2 1841 429.2 1842 429.2 1843 429.2 1844 429.2 1845 429.2 1846 429.2 1847 429.2 1848 429.2 1849 429.2 1850 429.2 1851 429.2 1852 429.2 1853 429.2 1854 429.2 1855 429.2 1856 429.2 1857 429.2 1858 429.2 1859 429.2 1860 429.2 1861 429.2 1862 429.2 1863 429.2 1864 429.2 1865 429.2 1866 429.2 1867 429.2 1868 429.2 1869 429.2 1870 429.2 1871 429.2 1872 429.2 1873 429.2 1874 429.2 1875 429.2 1876 429.2 1877 429.2 1878 429.2 1879 429.2 1880 429.2 1881 429.2 1882 429.2 1883 429.2 1884 429.2 1885 429.2 1886 429.2 1887 429.2 1888 429.2 1889 429.2 1890 429.2 1891 429.2 1892 429.2 1893 429.2 1894 429.1 1895 429.1 1896 429.1 1897 428.9 1898 428.8 1899 428.5 1900 428.2 1901 427.9 1902 427.4 1903 426.9 1904 426.4 1905 425.7 1906 425 1907 424.2 1908 423.4 1909 422.5 1910 421.6 1911 420.6 1912 419.6 1913 418.6 1914 417.6 1915 416.6 1916 415.6 1917 414.6 1918 413.6 1919 412.5 1920 411.5 1921 410.5 1922 409.5 1923 408.5 1924 407.5 1925 406.5 1926 405.5 1927 404.5 1928 403.5 1929 402.5 1930 401.5 1931 400.5 1932 399.4 1933 398.4 1934 397.4 1935 396.4 1936 382.3 1937 368.5 1938 355.1 1939 342 1940 329.2 1950 307.9 1951 292 1952 276.8 1953 262.3 1954 248.6 1955 235.3 1956 222.9 1957 211.1 1958 199.9 1959 189.4 1960 179.5 1961 170.2 1962 161.4 1963 153.2 1964 145.4 1965 138 1966 131 1967 124.2 1968 117.6 1969 111.3 1970 105.3 1971 99.5 1972 94.2 1973 89.2 1974 84.4 1975 79.9 1976 75.7 1977 71.7 1978 67.8 1979 64.3 1980 60.9 1981 57.8 1982 54.8 1983 52.1 1984 49.5 1985 47.1 1986 44.8 1987 42.7 1988 40.8 1989 38.9 1990 37.2 1991 35.5 1992 33.9 1993 32.4 1994 30.9 1995 29.5 1996 28.1 1997 26.8 1998 25.6 1999 24.5 2000 23.3 2001 22.3 2002 21.4 2003 20.4 2004 19.6 2005 18.8 2006 18 2007 17.2 2008 16.5 2009 15.8 2010 15.2 2011 15 2012 15.1 2013 14.6