Year Total
1800 6.13
1801 6.13
1802 6.13
1803 6.13
1804 6.13
1805 6.13
1806 6.13
1807 6.13
1808 6.13
1809 6.13
1810 6.13
1811 6.13
1812 6.13
1813 6.13
1814 6.13
1815 6.13
1816 6.13
1817 6.13
1818 6.13
1819 6.13
1820 6.13
1821 6.13
1822 6.13
1823 6.13
1824 6.13
1825 6.13
1826 6.13
1827 6.13
1828 6.13
1829 6.13
1830 6.13
1831 6.13
1832 6.13
1833 6.13
1834 6.13
1835 6.13
1836 6.13
1837 6.13
1838 6.13
1839 6.13
1840 6.13
1841 6.13
1842 6.13
1843 6.13
1844 6.13
1845 6.13
1846 6.13
1847 6.13
1848 6.13
1849 6.13
1850 6.13
1851 6.13
1852 6.13
1853 6.13
1854 6.13
1855 6.13
1856 6.13
1857 6.13
1858 6.13
1859 6.13
1860 6.13
1861 6.13
1862 6.13
1863 6.13
1864 6.13
1865 6.13
1866 6.13
1867 6.13
1868 6.13
1869 6.13
1870 6.13
1871 6.13
1872 6.13
1873 6.13
1874 6.13
1875 6.13
1876 6.13
1877 6.13
1878 6.13
1879 6.13
1880 6.13
1881 6.13
1882 6.13
1883 6.13
1884 6.13
1885 6.13
1886 6.13
1887 6.13
1888 6.13
1889 6.13
1890 6.13
1891 6.13
1892 6.13
1893 6.13
1894 6.13
1895 6.13
1896 6.13
1897 6.13
1898 6.13
1899 6.13
1900 6.13
1901 6.13
1902 6.13
1903 6.13
1904 6.13
1905 6.13
1906 6.13
1907 6.13
1908 6.13
1909 6.13
1910 6.13
1911 6.13
1912 6.13
1913 6.13
1914 6.13
1915 6.13
1916 6.13
1917 6.13
1918 6.13
1919 6.13
1920 6.13
1921 6.13
1922 6.13
1923 6.13
1924 6.13
1925 6.13
1926 6.12
1927 6.11
1928 6.11
1929 6.1
1930 6.09
1931 6.08
1932 6.08
1933 6.07
1934 6.06
1935 6.05
1936 6.05
1937 6.04
1938 6.03
1939 6.02
1940 6.01
1941 6.01
1942 6
1943 5.99
1944 5.98
1945 5.98
1946 5.97
1947 5.96
1948 5.95
1949 5.95
1950 5.94
1951 5.94
1952 5.94
1953 5.94
1954 5.95
1955 5.95
1956 5.95
1957 5.95
1958 5.96
1959 5.96
1960 5.96
1961 5.96
1962 5.97
1963 5.97
1964 5.97
1965 5.97
1966 5.97
1967 5.97
1968 5.97
1969 5.97
1970 5.97
1971 5.98
1972 5.99
1973 6.01
1974 6.03
1975 6.06
1976 6.1
1977 6.14
1978 6.19
1979 6.23
1980 6.28
1981 6.32
1982 6.35
1983 6.36
1984 6.37
1985 6.36
1986 6.34
1987 6.31
1988 6.27
1989 6.22
1990 6.15
1991 6.05
1992 5.93
1993 5.77
1994 5.59
1995 5.39
1996 5.17
1997 4.94
1998 4.72
1999 4.51
2000 4.31
2001 4.14
2002 3.98
2003 3.85
2004 3.72
2005 3.62
2006 3.52
2007 3.42
2008 3.33
2009 3.24
2010 3.15
2011 3.06
2012 2.97
2013 2.9
2014 2.82
2015 2.76
2016 2.7
2017 2.64
2018 2.59