Year Total
1800 6.49
1801 6.49
1802 6.49
1803 6.49
1804 6.49
1805 6.49
1806 6.49
1807 6.49
1808 6.49
1809 6.49
1810 6.49
1811 6.49
1812 6.49
1813 6.49
1814 6.49
1815 6.49
1816 6.49
1817 6.49
1818 6.49
1819 6.49
1820 6.49
1821 6.49
1822 6.49
1823 6.49
1824 6.49
1825 6.49
1826 6.49
1827 6.49
1828 6.49
1829 6.49
1830 6.49
1831 6.49
1832 6.49
1833 6.49
1834 6.49
1835 6.49
1836 6.49
1837 6.49
1838 6.49
1839 6.49
1840 6.49
1841 6.49
1842 6.49
1843 6.49
1844 6.49
1845 6.49
1846 6.49
1847 6.49
1848 6.49
1849 6.49
1850 6.49
1851 6.49
1852 6.49
1853 6.49
1854 6.49
1855 6.49
1856 6.49
1857 6.49
1858 6.49
1859 6.49
1860 6.49
1861 6.49
1862 6.49
1863 6.49
1864 6.49
1865 6.49
1866 6.49
1867 6.49
1868 6.49
1869 6.49
1870 6.49
1871 6.49
1872 6.49
1873 6.49
1874 6.49
1875 6.49
1876 6.49
1877 6.49
1878 6.49
1879 6.49
1880 6.49
1881 6.49
1882 6.49
1883 6.49
1884 6.49
1885 6.49
1886 6.49
1887 6.49
1888 6.49
1889 6.49
1890 6.49
1891 6.49
1892 6.49
1893 6.49
1894 6.49
1895 6.49
1896 6.49
1897 6.49
1898 6.49
1899 6.49
1900 6.49
1901 6.49
1902 6.49
1903 6.49
1904 6.49
1905 6.49
1906 6.49
1907 6.49
1908 6.49
1909 6.49
1910 6.49
1911 6.49
1912 6.49
1913 6.49
1914 6.49
1915 6.49
1916 6.49
1917 6.49
1918 6.49
1919 6.49
1920 6.49
1921 6.49
1922 6.49
1923 6.49
1924 6.49
1925 6.49
1926 6.49
1927 6.49
1928 6.49
1929 6.49
1930 6.49
1931 6.49
1932 6.49
1933 6.49
1934 6.49
1935 6.49
1936 6.49
1937 6.49
1938 6.49
1939 6.49
1940 6.49
1941 6.49
1942 6.49
1943 6.49
1944 6.49
1945 6.49
1946 6.49
1947 6.49
1948 6.49
1949 6.49
1950 6.49
1951 6.49
1952 6.5
1953 6.5
1954 6.51
1955 6.51
1956 6.51
1957 6.51
1958 6.51
1959 6.51
1960 6.5
1961 6.49
1962 6.47
1963 6.45
1964 6.41
1965 6.36
1966 6.28
1967 6.17
1968 6.04
1969 5.89
1970 5.74
1971 5.59
1972 5.46
1973 5.35
1974 5.27
1975 5.22
1976 5.2
1977 5.19
1978 5.19
1979 5.18
1980 5.17
1981 5.16
1982 5.13
1983 5.09
1984 5.04
1985 4.97
1986 4.9
1987 4.82
1988 4.73
1989 4.64
1990 4.55
1991 4.46
1992 4.37
1993 4.28
1994 4.2
1995 4.11
1996 4.01
1997 3.91
1998 3.8
1999 3.68
2000 3.55
2001 3.43
2002 3.32
2003 3.21
2004 3.12
2005 3.04
2006 2.97
2007 2.91
2008 2.85
2009 2.79
2010 2.73
2011 2.68
2012 2.63
2013 2.58
2014 2.54
2015 2.51
2016 2.48
2017 2.45
2018 2.43