Year Total
1800 6.96
1801 6.96
1802 6.96
1803 6.96
1804 6.96
1805 6.96
1806 6.96
1807 6.96
1808 6.96
1809 6.96
1810 6.96
1811 6.96
1812 6.96
1813 6.96
1814 6.96
1815 6.96
1816 6.96
1817 6.96
1818 6.96
1819 6.96
1820 6.96
1821 6.96
1822 6.96
1823 6.96
1824 6.96
1825 6.96
1826 6.96
1827 6.96
1828 6.96
1829 6.96
1830 6.96
1831 6.96
1832 6.96
1833 6.96
1834 6.96
1835 6.96
1836 6.96
1837 6.96
1838 6.96
1839 6.96
1840 6.96
1841 6.96
1842 6.96
1843 6.96
1844 6.96
1845 6.96
1846 6.96
1847 6.96
1848 6.96
1849 6.96
1850 6.96
1851 6.96
1852 6.96
1853 6.96
1854 6.96
1855 6.96
1856 6.96
1857 6.96
1858 6.96
1859 6.96
1860 6.96
1861 6.96
1862 6.96
1863 6.96
1864 6.96
1865 6.96
1866 6.96
1867 6.96
1868 6.96
1869 6.96
1870 6.96
1871 6.96
1872 6.96
1873 6.96
1874 6.96
1875 6.96
1876 6.96
1877 6.96
1878 6.96
1879 6.96
1880 6.96
1881 6.96
1882 6.96
1883 6.96
1884 6.96
1885 6.96
1886 6.96
1887 6.96
1888 6.96
1889 6.96
1890 6.96
1891 6.96
1892 6.96
1893 6.96
1894 6.96
1895 6.96
1896 6.96
1897 6.96
1898 6.96
1899 6.96
1900 6.96
1901 6.96
1902 6.96
1903 6.96
1904 6.96
1905 6.96
1906 6.96
1907 6.96
1908 6.96
1909 6.96
1910 6.96
1911 6.96
1912 6.96
1913 6.96
1914 6.96
1915 6.96
1916 6.96
1917 6.96
1918 6.96
1919 6.96
1920 6.96
1921 6.96
1922 6.96
1923 6.96
1924 6.96
1925 6.96
1926 6.96
1927 6.96
1928 6.96
1929 6.95
1930 6.95
1931 6.95
1932 6.95
1933 6.95
1934 6.95
1935 6.95
1936 6.94
1937 6.94
1938 6.94
1939 6.94
1940 6.94
1941 6.94
1942 6.94
1943 6.93
1944 6.93
1945 6.93
1946 6.93
1947 6.93
1948 6.93
1949 6.93
1950 6.92
1951 6.94
1952 6.96
1953 6.98
1954 6.99
1955 6.99
1956 6.98
1957 6.97
1958 6.95
1959 6.93
1960 6.9
1961 6.87
1962 6.84
1963 6.81
1964 6.78
1965 6.75
1966 6.73
1967 6.71
1968 6.69
1969 6.67
1970 6.65
1971 6.64
1972 6.62
1973 6.62
1974 6.61
1975 6.61
1976 6.61
1977 6.63
1978 6.64
1979 6.66
1980 6.68
1981 6.69
1982 6.69
1983 6.68
1984 6.67
1985 6.64
1986 6.6
1987 6.55
1988 6.5
1989 6.45
1990 6.39
1991 6.32
1992 6.23
1993 6.14
1994 6.03
1995 5.91
1996 5.79
1997 5.67
1998 5.55
1999 5.43
2000 5.33
2001 5.23
2002 5.15
2003 5.07
2004 5.01
2005 4.94
2006 4.88
2007 4.82
2008 4.75
2009 4.68
2010 4.61
2011 4.53
2012 4.44
2013 4.36
2014 4.29
2015 4.21
2016 4.13
2017 4.06
2018 3.99