Year Total
1800 6.23
1801 6.23
1802 6.23
1803 6.23
1804 6.23
1805 6.23
1806 6.23
1807 6.23
1808 6.23
1809 6.23
1810 6.23
1811 6.23
1812 6.23
1813 6.23
1814 6.23
1815 6.23
1816 6.23
1817 6.23
1818 6.23
1819 6.23
1820 6.23
1821 6.23
1822 6.23
1823 6.23
1824 6.23
1825 6.23
1826 6.23
1827 6.23
1828 6.23
1829 6.23
1830 6.23
1831 6.23
1832 6.23
1833 6.23
1834 6.23
1835 6.23
1836 6.23
1837 6.23
1838 6.23
1839 6.23
1840 6.23
1841 6.23
1842 6.23
1843 6.23
1844 6.23
1845 6.23
1846 6.23
1847 6.23
1848 6.23
1849 6.23
1850 6.23
1851 6.23
1852 6.23
1853 6.23
1854 6.23
1855 6.23
1856 6.23
1857 6.23
1858 6.23
1859 6.23
1860 6.23
1861 6.23
1862 6.23
1863 6.23
1864 6.23
1865 6.23
1866 6.23
1867 6.23
1868 6.23
1869 6.23
1870 6.23
1871 6.23
1872 6.23
1873 6.23
1874 6.23
1875 6.23
1876 6.23
1877 6.23
1878 6.23
1879 6.23
1880 6.23
1881 6.23
1882 6.23
1883 6.23
1884 6.23
1885 6.23
1886 6.23
1887 6.23
1888 6.23
1889 6.23
1890 6.23
1891 6.23
1892 6.23
1893 6.23
1894 6.23
1895 6.23
1896 6.23
1897 6.23
1898 6.23
1899 6.23
1900 6.23
1901 6.23
1902 6.23
1903 6.23
1904 6.23
1905 6.23
1906 6.23
1907 6.23
1908 6.23
1909 6.23
1910 6.23
1911 6.23
1912 6.23
1913 6.23
1914 6.23
1915 6.23
1916 6.23
1917 6.23
1918 6.23
1919 6.23
1920 6.23
1921 6.23
1922 6.23
1923 6.23
1924 6.23
1925 6.23
1926 6.23
1927 6.23
1928 6.23
1929 6.23
1930 6.23
1931 6.23
1932 6.23
1933 6.23
1934 6.23
1935 6.23
1936 6.23
1937 6.23
1938 6.23
1939 6.23
1940 6.23
1941 6.23
1942 6.23
1943 6.23
1944 6.23
1945 6.23
1946 6.23
1947 6.23
1948 6.23
1949 6.23
1950 6.23
1951 6.22
1952 6.2
1953 6.19
1954 6.19
1955 6.18
1956 6.19
1957 6.2
1958 6.21
1959 6.22
1960 6.24
1961 6.26
1962 6.28
1963 6.31
1964 6.33
1965 6.35
1966 6.37
1967 6.39
1968 6.42
1969 6.44
1970 6.47
1971 6.49
1972 6.51
1973 6.53
1974 6.53
1975 6.53
1976 6.52
1977 6.5
1978 6.47
1979 6.43
1980 6.39
1981 6.33
1982 6.28
1983 6.22
1984 6.16
1985 6.1
1986 6.04
1987 5.99
1988 5.93
1989 5.88
1990 5.82
1991 5.77
1992 5.71
1993 5.66
1994 5.6
1995 5.55
1996 5.49
1997 5.44
1998 5.38
1999 5.33
2000 5.28
2001 5.23
2002 5.17
2003 5.12
2004 5.07
2005 5.02
2006 4.97
2007 4.93
2008 4.88
2009 4.84
2010 4.79
2011 4.74
2012 4.69
2013 4.64
2014 4.58
2015 4.52
2016 4.46
2017 4.39
2018 4.33