Year Total 1800 6.64 1801 6.64 1802 6.64 1803 6.64 1804 6.64 1805 6.64 1806 6.64 1807 6.64 1808 6.64 1809 6.64 1810 6.64 1811 6.64 1812 6.64 1813 6.64 1814 6.64 1815 6.64 1816 6.64 1817 6.64 1818 6.64 1819 6.64 1820 6.64 1821 6.64 1822 6.64 1823 6.64 1824 6.64 1825 6.64 1826 6.64 1827 6.64 1828 6.64 1829 6.64 1830 6.64 1831 6.64 1832 6.64 1833 6.64 1834 6.64 1835 6.64 1836 6.64 1837 6.64 1838 6.64 1839 6.64 1840 6.64 1841 6.64 1842 6.64 1843 6.64 1844 6.64 1845 6.64 1846 6.64 1847 6.64 1848 6.64 1849 6.64 1850 6.64 1851 6.64 1852 6.64 1853 6.64 1854 6.64 1855 6.64 1856 6.64 1857 6.64 1858 6.64 1859 6.64 1860 6.64 1861 6.64 1862 6.64 1863 6.64 1864 6.64 1865 6.64 1866 6.64 1867 6.64 1868 6.64 1869 6.64 1870 6.64 1871 6.64 1872 6.64 1873 6.64 1874 6.64 1875 6.64 1876 6.64 1877 6.64 1878 6.64 1879 6.64 1880 6.64 1881 6.64 1882 6.64 1883 6.64 1884 6.64 1885 6.64 1886 6.64 1887 6.64 1888 6.64 1889 6.64 1890 6.64 1891 6.64 1892 6.64 1893 6.64 1894 6.64 1895 6.64 1896 6.64 1897 6.64 1898 6.64 1899 6.64 1900 6.64 1901 6.64 1902 6.64 1903 6.64 1904 6.64 1905 6.64 1906 6.64 1907 6.64 1908 6.64 1909 6.64 1910 6.64 1911 6.64 1912 6.64 1913 6.64 1914 6.64 1915 6.64 1916 6.64 1917 6.64 1918 6.64 1919 6.64 1920 6.64 1921 6.64 1922 6.64 1923 6.64 1924 6.64 1925 6.64 1926 6.64 1927 6.64 1928 6.64 1929 6.65 1930 6.65 1931 6.65 1932 6.65 1933 6.65 1934 6.65 1935 6.65 1936 6.66 1937 6.66 1938 6.66 1939 6.66 1940 6.66 1941 6.66 1942 6.66 1943 6.67 1944 6.67 1945 6.67 1946 6.67 1947 6.67 1948 6.67 1949 6.67 1950 6.68 1951 6.67 1952 6.65 1953 6.64 1954 6.64 1955 6.63 1956 6.64 1957 6.65 1958 6.66 1959 6.67 1960 6.69 1961 6.71 1962 6.74 1963 6.76 1964 6.79 1965 6.81 1966 6.83 1967 6.85 1968 6.87 1969 6.88 1970 6.89 1971 6.9 1972 6.91 1973 6.92 1974 6.93 1975 6.94 1976 6.93 1977 6.92 1978 6.89 1979 6.85 1980 6.8 1981 6.74 1982 6.67 1983 6.61 1984 6.54 1985 6.47 1986 6.4 1987 6.34 1988 6.27 1989 6.21 1990 6.15 1991 6.09 1992 6.03 1993 5.96 1994 5.9 1995 5.83 1996 5.76 1997 5.68 1998 5.61 1999 5.54 2000 5.47 2001 5.4 2002 5.33 2003 5.27 2004 5.2 2005 5.14 2006 5.09 2007 5.03 2008 4.98 2009 4.93 2010 4.88 2011 4.83 2012 4.77 2013 4.72 2014 4.66 2015 4.6 2016 4.53 2017 4.47 2018 4.41