Year Total
1800 6.75
1801 6.75
1802 6.75
1803 6.75
1804 6.75
1805 6.75
1806 6.75
1807 6.75
1808 6.75
1809 6.75
1810 6.75
1811 6.75
1812 6.75
1813 6.75
1814 6.75
1815 6.75
1816 6.75
1817 6.75
1818 6.75
1819 6.75
1820 6.75
1821 6.75
1822 6.75
1823 6.75
1824 6.75
1825 6.75
1826 6.75
1827 6.75
1828 6.75
1829 6.75
1830 6.75
1831 6.75
1832 6.75
1833 6.75
1834 6.75
1835 6.75
1836 6.75
1837 6.75
1838 6.75
1839 6.75
1840 6.75
1841 6.75
1842 6.75
1843 6.75
1844 6.75
1845 6.75
1846 6.75
1847 6.75
1848 6.75
1849 6.75
1850 6.75
1851 6.75
1852 6.75
1853 6.75
1854 6.75
1855 6.75
1856 6.75
1857 6.75
1858 6.75
1859 6.75
1860 6.75
1861 6.75
1862 6.75
1863 6.75
1864 6.75
1865 6.75
1866 6.75
1867 6.75
1868 6.75
1869 6.75
1870 6.75
1871 6.75
1872 6.75
1873 6.75
1874 6.75
1875 6.75
1876 6.75
1877 6.75
1878 6.75
1879 6.75
1880 6.75
1881 6.75
1882 6.75
1883 6.75
1884 6.75
1885 6.75
1886 6.75
1887 6.75
1888 6.75
1889 6.75
1890 6.75
1891 6.75
1892 6.75
1893 6.75
1894 6.75
1895 6.75
1896 6.75
1897 6.75
1898 6.75
1899 6.75
1900 6.75
1901 6.75
1902 6.75
1903 6.75
1904 6.75
1905 6.75
1906 6.75
1907 6.75
1908 6.75
1909 6.75
1910 6.75
1911 6.75
1912 6.75
1913 6.75
1914 6.75
1915 6.75
1916 6.75
1917 6.75
1918 6.75
1919 6.75
1920 6.75
1921 6.75
1922 6.75
1923 6.75
1924 6.75
1925 6.75
1926 6.75
1927 6.75
1928 6.75
1929 6.75
1930 6.75
1931 6.75
1932 6.75
1933 6.75
1934 6.75
1935 6.75
1936 6.75
1937 6.75
1938 6.75
1939 6.75
1940 6.75
1941 6.75
1942 6.75
1943 6.75
1944 6.75
1945 6.75
1946 6.75
1947 6.75
1948 6.75
1949 6.75
1950 6.75
1951 6.76
1952 6.78
1953 6.81
1954 6.84
1955 6.88
1956 6.93
1957 6.98
1958 7.04
1959 7.1
1960 7.16
1961 7.22
1962 7.27
1963 7.31
1964 7.35
1965 7.37
1966 7.39
1967 7.4
1968 7.41
1969 7.42
1970 7.42
1971 7.42
1972 7.42
1973 7.42
1974 7.41
1975 7.4
1976 7.37
1977 7.33
1978 7.27
1979 7.2
1980 7.1
1981 6.97
1982 6.81
1983 6.63
1984 6.44
1985 6.22
1986 6
1987 5.78
1988 5.57
1989 5.37
1990 5.18
1991 5
1992 4.84
1993 4.69
1994 4.56
1995 4.43
1996 4.33
1997 4.24
1998 4.16
1999 4.1
2000 4.06
2001 4.02
2002 4
2003 3.99
2004 3.98
2005 3.99
2006 3.99
2007 4
2008 4.01
2009 4.02
2010 4.03
2011 4.02
2012 4
2013 3.96
2014 3.9
2015 3.84
2016 3.76
2017 3.68
2018 3.61