Year Total
1800 6.71
1801 6.71
1802 6.71
1803 6.71
1804 6.71
1805 6.71
1806 6.71
1807 6.71
1808 6.71
1809 6.71
1810 6.71
1811 6.71
1812 6.71
1813 6.71
1814 6.71
1815 6.71
1816 6.71
1817 6.71
1818 6.71
1819 6.71
1820 6.71
1821 6.71
1822 6.71
1823 6.71
1824 6.71
1825 6.71
1826 6.71
1827 6.71
1828 6.71
1829 6.71
1830 6.71
1831 6.71
1832 6.71
1833 6.71
1834 6.71
1835 6.71
1836 6.71
1837 6.71
1838 6.71
1839 6.71
1840 6.71
1841 6.71
1842 6.71
1843 6.71
1844 6.71
1845 6.71
1846 6.71
1847 6.71
1848 6.71
1849 6.71
1850 6.71
1851 6.71
1852 6.71
1853 6.71
1854 6.71
1855 6.71
1856 6.71
1857 6.71
1858 6.71
1859 6.71
1860 6.71
1861 6.71
1862 6.71
1863 6.71
1864 6.71
1865 6.71
1866 6.71
1867 6.71
1868 6.71
1869 6.71
1870 6.71
1871 6.71
1872 6.71
1873 6.71
1874 6.71
1875 6.71
1876 6.71
1877 6.71
1878 6.71
1879 6.71
1880 6.71
1881 6.71
1882 6.71
1883 6.71
1884 6.71
1885 6.71
1886 6.71
1887 6.71
1888 6.71
1889 6.71
1890 6.71
1891 6.71
1892 6.71
1893 6.71
1894 6.71
1895 6.71
1896 6.71
1897 6.71
1898 6.71
1899 6.71
1900 6.71
1901 6.71
1902 6.71
1903 6.71
1904 6.71
1905 6.71
1906 6.71
1907 6.71
1908 6.71
1909 6.71
1910 6.71
1911 6.71
1912 6.71
1913 6.71
1914 6.71
1915 6.71
1916 6.71
1917 6.71
1918 6.71
1919 6.71
1920 6.71
1921 6.71
1922 6.71
1923 6.71
1924 6.71
1925 6.71
1926 6.71
1927 6.71
1928 6.71
1929 6.71
1930 6.71
1931 6.71
1932 6.71
1933 6.71
1934 6.71
1935 6.71
1936 6.71
1937 6.71
1938 6.71
1939 6.7
1940 6.7
1941 6.7
1942 6.7
1943 6.7
1944 6.69
1945 6.69
1946 6.69
1947 6.68
1948 6.68
1949 6.68
1950 6.67
1951 6.68
1952 6.7
1953 6.73
1954 6.77
1955 6.81
1956 6.86
1957 6.92
1958 6.98
1959 7.05
1960 7.12
1961 7.17
1962 7.21
1963 7.25
1964 7.27
1965 7.29
1966 7.3
1967 7.32
1968 7.33
1969 7.35
1970 7.37
1971 7.38
1972 7.39
1973 7.39
1974 7.38
1975 7.36
1976 7.32
1977 7.28
1978 7.22
1979 7.16
1980 7.09
1981 7.02
1982 6.95
1983 6.88
1984 6.81
1985 6.75
1986 6.69
1987 6.62
1988 6.56
1989 6.5
1990 6.44
1991 6.38
1992 6.33
1993 6.28
1994 6.23
1995 6.19
1996 6.15
1997 6.12
1998 6.09
1999 6.07
2000 6.04
2001 6
2002 5.96
2003 5.92
2004 5.86
2005 5.79
2006 5.72
2007 5.64
2008 5.56
2009 5.48
2010 5.4
2011 5.32
2012 5.24
2013 5.17
2014 5.1
2015 5.04
2016 4.98
2017 4.93
2018 4.87