Year Total 1800 6.67 1801 6.67 1802 6.67 1803 6.67 1804 6.67 1805 6.67 1806 6.67 1807 6.67 1808 6.67 1809 6.67 1810 6.67 1811 6.67 1812 6.67 1813 6.67 1814 6.67 1815 6.67 1816 6.67 1817 6.67 1818 6.67 1819 6.67 1820 6.67 1821 6.67 1822 6.67 1823 6.67 1824 6.67 1825 6.67 1826 6.67 1827 6.67 1828 6.67 1829 6.67 1830 6.67 1831 6.67 1832 6.67 1833 6.67 1834 6.67 1835 6.67 1836 6.67 1837 6.67 1838 6.67 1839 6.67 1840 6.67 1841 6.67 1842 6.67 1843 6.67 1844 6.67 1845 6.67 1846 6.67 1847 6.67 1848 6.67 1849 6.67 1850 6.67 1851 6.67 1852 6.67 1853 6.67 1854 6.67 1855 6.67 1856 6.67 1857 6.67 1858 6.67 1859 6.67 1860 6.67 1861 6.67 1862 6.67 1863 6.67 1864 6.67 1865 6.67 1866 6.67 1867 6.67 1868 6.67 1869 6.67 1870 6.67 1871 6.67 1872 6.67 1873 6.67 1874 6.67 1875 6.67 1876 6.67 1877 6.67 1878 6.67 1879 6.67 1880 6.67 1881 6.67 1882 6.67 1883 6.67 1884 6.67 1885 6.67 1886 6.67 1887 6.67 1888 6.67 1889 6.67 1890 6.67 1891 6.67 1892 6.67 1893 6.67 1894 6.67 1895 6.67 1896 6.67 1897 6.67 1898 6.67 1899 6.67 1900 6.67 1901 6.67 1902 6.67 1903 6.67 1904 6.67 1905 6.67 1906 6.67 1907 6.67 1908 6.67 1909 6.67 1910 6.67 1911 6.67 1912 6.67 1913 6.67 1914 6.67 1915 6.67 1916 6.67 1917 6.67 1918 6.67 1919 6.67 1920 6.67 1921 6.67 1922 6.67 1923 6.67 1924 6.67 1925 6.67 1926 6.67 1927 6.67 1928 6.67 1929 6.67 1930 6.67 1931 6.67 1932 6.67 1933 6.67 1934 6.67 1935 6.67 1936 6.67 1937 6.67 1938 6.67 1939 6.67 1940 6.67 1941 6.67 1942 6.67 1943 6.67 1944 6.67 1945 6.67 1946 6.67 1947 6.67 1948 6.67 1949 6.67 1950 6.67 1951 6.67 1952 6.67 1953 6.67 1954 6.67 1955 6.67 1956 6.67 1957 6.67 1958 6.67 1959 6.67 1960 6.67 1961 6.67 1962 6.67 1963 6.67 1964 6.67 1965 6.67 1966 6.67 1967 6.67 1968 6.67 1969 6.67 1970 6.67 1971 6.67 1972 6.68 1973 6.69 1974 6.69 1975 6.69 1976 6.69 1977 6.67 1978 6.64 1979 6.6 1980 6.55 1981 6.5 1982 6.46 1983 6.41 1984 6.36 1985 6.31 1986 6.23 1987 6.13 1988 5.99 1989 5.83 1990 5.64 1991 5.43 1992 5.22 1993 5 1994 4.8 1995 4.6 1996 4.4 1997 4.2 1998 4 1999 3.8 2000 3.6 2001 3.42 2002 3.24 2003 3.09 2004 2.95 2005 2.84 2006 2.73 2007 2.64 2008 2.55 2009 2.46 2010 2.38 2011 2.31 2012 2.24 2013 2.18 2014 2.13 2015 2.09 2016 2.05 2017 2.02 2018 1.99