Year Total
1800 6.78
1801 6.78
1802 6.78
1803 6.78
1804 6.78
1805 6.78
1806 6.78
1807 6.78
1808 6.78
1809 6.78
1810 6.78
1811 6.78
1812 6.78
1813 6.78
1814 6.78
1815 6.78
1816 6.78
1817 6.78
1818 6.78
1819 6.78
1820 6.78
1821 6.78
1822 6.78
1823 6.78
1824 6.78
1825 6.78
1826 6.78
1827 6.78
1828 6.78
1829 6.78
1830 6.78
1831 6.78
1832 6.78
1833 6.78
1834 6.78
1835 6.78
1836 6.78
1837 6.78
1838 6.78
1839 6.78
1840 6.78
1841 6.78
1842 6.78
1843 6.78
1844 6.78
1845 6.78
1846 6.78
1847 6.78
1848 6.78
1849 6.78
1850 6.78
1851 6.78
1852 6.78
1853 6.78
1854 6.78
1855 6.78
1856 6.78
1857 6.78
1858 6.78
1859 6.78
1860 6.78
1861 6.78
1862 6.78
1863 6.78
1864 6.78
1865 6.78
1866 6.78
1867 6.78
1868 6.78
1869 6.78
1870 6.78
1871 6.78
1872 6.78
1873 6.78
1874 6.78
1875 6.78
1876 6.78
1877 6.78
1878 6.78
1879 6.78
1880 6.78
1881 6.78
1882 6.78
1883 6.78
1884 6.78
1885 6.78
1886 6.78
1887 6.78
1888 6.78
1889 6.78
1890 6.78
1891 6.78
1892 6.78
1893 6.78
1894 6.78
1895 6.78
1896 6.78
1897 6.78
1898 6.78
1899 6.78
1900 6.78
1901 6.78
1902 6.78
1903 6.78
1904 6.78
1905 6.78
1906 6.78
1907 6.78
1908 6.78
1909 6.78
1910 6.78
1911 6.78
1912 6.78
1913 6.78
1914 6.78
1915 6.78
1916 6.78
1917 6.78
1918 6.78
1919 6.78
1920 6.78
1921 6.78
1922 6.78
1923 6.78
1924 6.78
1925 6.78
1926 6.78
1927 6.78
1928 6.78
1929 6.78
1930 6.78
1931 6.78
1932 6.78
1933 6.78
1934 6.78
1935 6.78
1936 6.78
1937 6.79
1938 6.79
1939 6.79
1940 6.79
1941 6.79
1942 6.79
1943 6.79
1944 6.8
1945 6.8
1946 6.8
1947 6.8
1948 6.8
1949 6.81
1950 6.81
1951 6.81
1952 6.82
1953 6.82
1954 6.83
1955 6.85
1956 6.86
1957 6.88
1958 6.9
1959 6.92
1960 6.94
1961 6.96
1962 6.99
1963 7.02
1964 7.06
1965 7.1
1966 7.14
1967 7.18
1968 7.22
1969 7.26
1970 7.3
1971 7.35
1972 7.39
1973 7.43
1974 7.48
1975 7.52
1976 7.56
1977 7.59
1978 7.62
1979 7.64
1980 7.64
1981 7.64
1982 7.62
1983 7.59
1984 7.54
1985 7.47
1986 7.39
1987 7.29
1988 7.18
1989 7.05
1990 6.92
1991 6.8
1992 6.68
1993 6.58
1994 6.5
1995 6.42
1996 6.36
1997 6.31
1998 6.26
1999 6.2
2000 6.15
2001 6.1
2002 6.05
2003 6
2004 5.96
2005 5.9
2006 5.83
2007 5.73
2008 5.61
2009 5.47
2010 5.31
2011 5.15
2012 4.99
2013 4.86
2014 4.74
2015 4.65
2016 4.57
2017 4.51
2018 4.44