Year Total
1800 6.37
1801 6.37
1802 6.37
1803 6.37
1804 6.37
1805 6.37
1806 6.37
1807 6.37
1808 6.37
1809 6.37
1810 6.37
1811 6.37
1812 6.37
1813 6.37
1814 6.37
1815 6.37
1816 6.37
1817 6.37
1818 6.37
1819 6.37
1820 6.37
1821 6.37
1822 6.37
1823 6.37
1824 6.37
1825 6.37
1826 6.37
1827 6.37
1828 6.37
1829 6.37
1830 6.37
1831 6.37
1832 6.37
1833 6.37
1834 6.37
1835 6.37
1836 6.37
1837 6.37
1838 6.37
1839 6.37
1840 6.37
1841 6.37
1842 6.37
1843 6.37
1844 6.37
1845 6.37
1846 6.37
1847 6.37
1848 6.37
1849 6.37
1850 6.37
1851 6.37
1852 6.37
1853 6.37
1854 6.37
1855 6.37
1856 6.37
1857 6.37
1858 6.37
1859 6.37
1860 6.37
1861 6.37
1862 6.37
1863 6.37
1864 6.37
1865 6.37
1866 6.37
1867 6.37
1868 6.37
1869 6.37
1870 6.37
1871 6.37
1872 6.37
1873 6.37
1874 6.37
1875 6.37
1876 6.37
1877 6.37
1878 6.37
1879 6.37
1880 6.37
1881 6.37
1882 6.37
1883 6.37
1884 6.37
1885 6.37
1886 6.37
1887 6.37
1888 6.37
1889 6.37
1890 6.37
1891 6.37
1892 6.37
1893 6.37
1894 6.37
1895 6.37
1896 6.37
1897 6.37
1898 6.37
1899 6.37
1900 6.37
1901 6.37
1902 6.37
1903 6.37
1904 6.37
1905 6.37
1906 6.37
1907 6.37
1908 6.37
1909 6.37
1910 6.37
1911 6.37
1912 6.37
1913 6.37
1914 6.37
1915 6.37
1916 6.37
1917 6.37
1918 6.37
1919 6.37
1920 6.37
1921 6.37
1922 6.37
1923 6.37
1924 6.37
1925 6.37
1926 6.33
1927 6.3
1928 6.26
1929 6.22
1930 6.18
1931 6.15
1932 6.11
1933 6.07
1934 6.04
1935 6
1936 5.96
1937 5.93
1938 5.89
1939 5.85
1940 5.81
1941 5.78
1942 5.74
1943 5.7
1944 5.67
1945 5.63
1946 5.59
1947 5.56
1948 5.52
1949 5.48
1950 5.44
1951 5.46
1952 5.49
1953 5.54
1954 5.6
1955 5.68
1956 5.76
1957 5.85
1958 5.94
1959 6.01
1960 6.05
1961 6.05
1962 5.98
1963 5.86
1964 5.67
1965 5.44
1966 5.19
1967 4.94
1968 4.72
1969 4.53
1970 4.37
1971 4.25
1972 4.14
1973 4.03
1974 3.92
1975 3.8
1976 3.68
1977 3.56
1978 3.45
1979 3.34
1980 3.25
1981 3.18
1982 3.13
1983 3.1
1984 3.09
1985 3.1
1986 3.1
1987 3.1
1988 3.08
1989 3.05
1990 3.01
1991 2.97
1992 2.93
1993 2.9
1994 2.88
1995 2.87
1996 2.87
1997 2.87
1998 2.86
1999 2.85
2000 2.82
2001 2.79
2002 2.76
2003 2.72
2004 2.68
2005 2.64
2006 2.6
2007 2.56
2008 2.53
2009 2.5
2010 2.47
2011 2.45
2012 2.43
2013 2.41
2014 2.39
2015 2.37
2016 2.35
2017 2.33
2018 2.31