Year Total
1800 6.34
1801 6.34
1802 6.34
1803 6.34
1804 6.34
1805 6.34
1806 6.34
1807 6.34
1808 6.34
1809 6.34
1810 6.34
1811 6.34
1812 6.34
1813 6.34
1814 6.34
1815 6.34
1816 6.34
1817 6.34
1818 6.34
1819 6.34
1820 6.34
1821 6.34
1822 6.34
1823 6.34
1824 6.34
1825 6.34
1826 6.34
1827 6.34
1828 6.34
1829 6.34
1830 6.34
1831 6.34
1832 6.34
1833 6.34
1834 6.34
1835 6.34
1836 6.34
1837 6.34
1838 6.34
1839 6.34
1840 6.34
1841 6.34
1842 6.34
1843 6.34
1844 6.34
1845 6.34
1846 6.34
1847 6.34
1848 6.34
1849 6.34
1850 6.34
1851 6.34
1852 6.34
1853 6.34
1854 6.34
1855 6.34
1856 6.34
1857 6.34
1858 6.34
1859 6.34
1860 6.34
1861 6.34
1862 6.34
1863 6.34
1864 6.34
1865 6.34
1866 6.34
1867 6.34
1868 6.34
1869 6.34
1870 6.34
1871 6.34
1872 6.34
1873 6.34
1874 6.34
1875 6.34
1876 6.34
1877 6.34
1878 6.34
1879 6.34
1880 6.34
1881 6.34
1882 6.34
1883 6.34
1884 6.34
1885 6.34
1886 6.34
1887 6.34
1888 6.34
1889 6.34
1890 6.34
1891 6.34
1892 6.34
1893 6.34
1894 6.34
1895 6.34
1896 6.34
1897 6.34
1898 6.34
1899 6.34
1900 6.34
1901 6.34
1902 6.34
1903 6.34
1904 6.34
1905 6.34
1906 6.34
1907 6.34
1908 6.34
1909 6.34
1910 6.34
1911 6.34
1912 6.34
1913 6.34
1914 6.34
1915 6.34
1916 6.34
1917 6.34
1918 6.34
1919 6.34
1920 6.34
1921 6.34
1922 6.34
1923 6.34
1924 6.34
1925 6.34
1926 6.33
1927 6.32
1928 6.31
1929 6.3
1930 6.3
1931 6.29
1932 6.28
1933 6.27
1934 6.26
1935 6.25
1936 6.24
1937 6.23
1938 6.22
1939 6.22
1940 6.21
1941 6.2
1942 6.19
1943 6.18
1944 6.17
1945 6.16
1946 6.15
1947 6.14
1948 6.13
1949 6.13
1950 6.12
1951 6.18
1952 6.3
1953 6.4
1954 6.49
1955 6.57
1956 6.63
1957 6.69
1958 6.73
1959 6.76
1960 6.78
1961 6.79
1962 6.79
1963 6.8
1964 6.8
1965 6.8
1966 6.8
1967 6.8
1968 6.8
1969 6.79
1970 6.78
1971 6.77
1972 6.76
1973 6.74
1974 6.71
1975 6.68
1976 6.64
1977 6.6
1978 6.55
1979 6.5
1980 6.46
1981 6.41
1982 6.37
1983 6.32
1984 6.28
1985 6.24
1986 6.21
1987 6.17
1988 6.13
1989 6.09
1990 6.04
1991 5.99
1992 5.94
1993 5.88
1994 5.83
1995 5.77
1996 5.7
1997 5.64
1998 5.58
1999 5.51
2000 5.45
2001 5.39
2002 5.34
2003 5.28
2004 5.23
2005 5.18
2006 5.14
2007 5.1
2008 5.06
2009 5.02
2010 4.98
2011 4.94
2012 4.9
2013 4.85
2014 4.79
2015 4.74
2016 4.67
2017 4.61
2018 4.55