Year Years 1800 375.2 1801 375.2 1802 375.2 1803 375.2 1804 375.2 1805 375.2 1806 375.2 1807 375.2 1808 375.2 1809 375.2 1810 375.2 1811 375.2 1812 375.2 1813 375.2 1814 375.2 1815 375.2 1816 375.2 1817 375.2 1818 375.2 1819 375.2 1820 375.2 1821 375.2 1822 375.2 1823 375.2 1824 375.2 1825 375.2 1826 375.2 1827 375.2 1828 375.2 1829 375.2 1830 375.2 1831 375.2 1832 375.2 1833 375.2 1834 375.2 1835 375.2 1836 375.2 1837 375.2 1838 375.2 1839 375.2 1840 375.2 1841 375.2 1842 375.2 1843 375.2 1844 375.2 1845 375.2 1846 375.2 1847 375.2 1848 375.2 1849 375.2 1850 375.2 1851 375.2 1852 375.2 1853 375.2 1854 375.2 1855 375.2 1856 375.2 1857 375.2 1858 375.2 1859 375.2 1860 375.2 1861 375.2 1862 375.2 1863 375.2 1864 375.2 1865 375.2 1866 375.2 1867 375.2 1868 375.2 1869 375.2 1870 375.2 1871 375.2 1872 375.2 1873 375.2 1874 375.2 1875 375.2 1876 375.2 1877 375.2 1878 375.2 1879 375.2 1880 375.2 1881 375.2 1882 375.2 1883 375.2 1884 375.2 1885 375.2 1886 375.2 1887 375.2 1888 375.2 1889 375.2 1890 375.2 1891 375.2 1892 375.2 1893 375.2 1894 375.2 1895 375.2 1896 375.1 1897 375 1898 374.9 1899 374.6 1900 374.4 1901 374.1 1902 373.7 1903 373.2 1904 372.8 1905 372.2 1906 371.6 1907 370.9 1908 370.2 1909 369.4 1910 368.6 1911 367.7 1912 366.8 1913 366 1914 365.1 1915 364.2 1916 363.3 1917 362.4 1918 361.6 1919 360.7 1920 359.8 1921 349.8 1922 340 1923 330.4 1924 320.9 1925 311.7 1926 302.6 1927 294.6 1928 285.9 1929 277.2 1930 268.7 1931 260.4 1932 252.2 1933 244.2 1934 236.3 1935 228.5 1936 220.9 1937 213.4 1938 206.1 1939 198.8 1940 191.8 1941 185.6 1942 178.7 1943 172 1944 165.4 1945 158.9 1946 152.5 1947 146.3 1948 140.2 1949 134.1 1950 128.2 1951 127.2 1952 124.9 1953 122.3 1954 119.1 1955 115.7 1956 110.9 1957 106.7 1958 101.3 1959 96.57 1960 91.43 1961 86.45 1962 81.61 1963 77.44 1964 73.39 1965 69.43 1966 65.61 1967 62.34 1968 58.8 1969 55.44 1970 52.25 1971 49.7 1972 47.27 1973 45.38 1974 43.51 1984 26.8 1985 24.5 1986 22.4 1987 20.5 1988 18.9 1989 17.7 1990 16.7 1991 16 1992 15.6 1993 15.4 1994 15.2 1995 15.1 1996 15 1997 14.8 1998 14.6 1999 14.2 2000 13.7 2001 13.2 2002 12.5 2003 11.8 2004 11.1 2005 10.4 2006 9.6 2007 8.9 2008 8.1 2009 7.5 2010 6.8 2011 6.2 2012 5.7 2013 5.3