Year Total
1800 6.06
1801 6.06
1802 6.06
1803 6.06
1804 6.06
1805 6.06
1806 6.06
1807 6.06
1808 6.06
1809 6.06
1810 6.06
1811 6.06
1812 6.06
1813 6.06
1814 6.06
1815 6.05
1816 6.05
1817 6.05
1818 6.05
1819 6.05
1820 6.05
1821 6.05
1822 6.05
1823 6.05
1824 6.05
1825 6.05
1826 6.05
1827 6.05
1828 6.05
1829 6.05
1830 6.05
1831 6.05
1832 6.05
1833 6.05
1834 6.05
1835 6.05
1836 6.05
1837 6.05
1838 6.05
1839 6.05
1840 6.05
1841 6.05
1842 6.05
1843 6.05
1844 6.05
1845 6.04
1846 6.04
1847 6.04
1848 6.04
1849 6.04
1850 6.04
1851 6.04
1852 6.04
1853 6.04
1854 6.04
1855 6.04
1856 6.04
1857 6.04
1858 6.04
1859 6.04
1860 6.04
1861 6.04
1862 6.04
1863 6.04
1864 6.04
1865 6.04
1866 6.04
1867 6.04
1868 6.04
1869 6.04
1870 6.04
1871 6.04
1872 6.04
1873 6.04
1874 6.04
1875 6.03
1876 6.03
1877 6.03
1878 6.03
1879 6.03
1880 6.03
1881 6.03
1882 6.03
1883 6.03
1884 6.03
1885 6.03
1886 6.03
1887 6.03
1888 6.03
1889 6.03
1890 6.03
1891 6.03
1892 6.03
1893 6.03
1894 6.03
1895 6.03
1896 6.03
1897 6.03
1898 6.03
1899 6.03
1900 6.03
1901 6.03
1902 6.03
1903 6.03
1904 6.03
1905 6.02
1906 6.02
1907 6.02
1908 6.02
1909 6.02
1910 6.02
1911 6.02
1912 6.02
1913 5.99
1914 5.97
1915 5.94
1916 5.97
1917 5.99
1918 6.02
1919 6.05
1920 6.08
1921 6.08
1922 6.07
1923 6.07
1924 6.07
1925 6.07
1926 6.15
1927 6.24
1928 6.33
1929 6.42
1930 6.51
1931 6.4
1932 6.29
1933 6.18
1934 6.08
1935 5.97
1936 5.95
1937 5.93
1938 5.91
1939 5.9
1940 5.88
1941 5.92
1942 5.97
1943 6.01
1944 6.05
1945 6.1
1946 6.21
1947 6.32
1948 6.43
1949 6.54
1950 6.65
1951 6.66
1952 6.69
1953 6.71
1954 6.72
1955 6.73
1956 6.74
1957 6.74
1958 6.74
1959 6.73
1960 6.72
1961 6.7
1962 6.67
1963 6.65
1964 6.62
1965 6.58
1966 6.53
1967 6.47
1968 6.4
1969 6.32
1970 6.23
1971 6.14
1972 6.06
1973 5.97
1974 5.9
1975 5.83
1976 5.78
1977 5.73
1978 5.68
1979 5.64
1980 5.6
1981 5.56
1982 5.53
1983 5.49
1984 5.44
1985 5.38
1986 5.29
1987 5.18
1988 5.03
1989 4.86
1990 4.66
1991 4.46
1992 4.25
1993 4.05
1994 3.87
1995 3.71
1996 3.57
1997 3.46
1998 3.37
1999 3.29
2000 3.23
2001 3.18
2002 3.13
2003 3.09
2004 3.05
2005 3.02
2006 3
2007 3.02
2008 3.06
2009 3.11
2010 3.19
2011 3.25
2012 3.31
2013 3.34
2014 3.34
2015 3.31
2016 3.27
2017 3.21
2018 3.15