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 358.9 1922 358 1923 357.1 1924 356.3 1925 355.4 1926 354.5 1927 353.6 1928 352.8 1929 351.9 1930 341 1931 330.3 1932 319.9 1933 309.6 1934 299.6 1935 289.8 1936 280.1 1937 270.7 1938 261.5 1939 253.3 1940 244.4 1941 235.6 1942 227.1 1943 218.7 1944 210.4 1945 202.4 1946 194.5 1947 186.7 1948 179.1 1949 171.6 1950 164.3 1978 89.5 1979 83.1 1980 77.3 1981 72 1982 66.9 1983 62.2 1984 57.9 1985 53.9 1986 50.5 1987 47.4 1988 44.7 1989 42.5 1990 40.5 1991 38.8 1992 37.3 1993 35.9 1994 34.5 1995 33.1 1996 31.7 1997 30.3 1998 28.8 1999 27.5 2000 26.1 2001 24.8 2002 23.6 2003 22.5 2004 21.4 2005 20.4 2006 19.5 2007 18.7 2008 17.9 2009 17.2 2010 16.5 2011 15.9 2012 15.4 2013 14.9