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 6.77
1927 6.77
1928 6.76
1929 6.75
1930 6.75
1931 6.74
1932 6.74
1933 6.73
1934 6.72
1935 6.72
1936 6.71
1937 6.7
1938 6.7
1939 6.69
1940 6.69
1941 6.68
1942 6.67
1943 6.67
1944 6.66
1945 6.65
1946 6.65
1947 6.64
1948 6.63
1949 6.63
1950 6.62
1951 6.66
1952 6.74
1953 6.81
1954 6.89
1955 6.97
1956 7.04
1957 7.12
1958 7.2
1959 7.27
1960 7.35
1961 7.43
1962 7.51
1963 7.58
1964 7.65
1965 7.71
1966 7.77
1967 7.82
1968 7.86
1969 7.89
1970 7.91
1971 7.93
1972 7.94
1973 7.94
1974 7.93
1975 7.91
1976 7.88
1977 7.83
1978 7.77
1979 7.69
1980 7.6
1981 7.49
1982 7.38
1983 7.27
1984 7.15
1985 7.04
1986 6.93
1987 6.82
1988 6.71
1989 6.6
1990 6.5
1991 6.4
1992 6.3
1993 6.22
1994 6.14
1995 6.06
1996 5.99
1997 5.92
1998 5.85
1999 5.78
2000 5.71
2001 5.65
2002 5.58
2003 5.52
2004 5.47
2005 5.42
2006 5.38
2007 5.34
2008 5.3
2009 5.26
2010 5.22
2011 5.18
2012 5.14
2013 5.08
2014 5.03
2015 4.97
2016 4.91
2017 4.85
2018 4.78