Year Total
1800 6.43
1801 6.43
1802 6.43
1803 6.43
1804 6.44
1805 6.44
1806 6.44
1807 6.44
1808 6.44
1809 6.44
1810 6.45
1811 6.45
1812 6.45
1813 6.45
1814 6.45
1815 6.45
1816 6.45
1817 6.46
1818 6.46
1819 6.46
1820 6.46
1821 6.46
1822 6.46
1823 6.46
1824 6.47
1825 6.47
1826 6.47
1827 6.47
1828 6.47
1829 6.47
1830 6.48
1831 6.48
1832 6.48
1833 6.48
1834 6.48
1835 6.48
1836 6.48
1837 6.49
1838 6.49
1839 6.49
1840 6.49
1841 6.49
1842 6.49
1843 6.5
1844 6.5
1845 6.5
1846 6.5
1847 6.5
1848 6.5
1849 6.5
1850 6.51
1851 6.51
1852 6.51
1853 6.51
1854 6.51
1855 6.51
1856 6.52
1857 6.52
1858 6.52
1859 6.52
1860 6.52
1861 6.52
1862 6.52
1863 6.53
1864 6.53
1865 6.53
1866 6.53
1867 6.53
1868 6.53
1869 6.53
1870 6.54
1871 6.54
1872 6.54
1873 6.54
1874 6.54
1875 6.54
1876 6.55
1877 6.55
1878 6.55
1879 6.55
1880 6.55
1881 6.55
1882 6.55
1883 6.56
1884 6.56
1885 6.56
1886 6.56
1887 6.56
1888 6.56
1889 6.57
1890 6.57
1891 6.57
1892 6.57
1893 6.57
1894 6.57
1895 6.57
1896 6.58
1897 6.58
1898 6.58
1899 6.58
1900 6.58
1901 6.58
1902 6.59
1903 6.59
1904 6.59
1905 6.59
1906 6.59
1907 6.59
1908 6.59
1909 6.6
1910 6.6
1911 6.6
1912 6.6
1913 6.6
1914 6.6
1915 6.6
1916 6.61
1917 6.61
1918 6.61
1919 6.61
1920 6.61
1921 6.61
1922 6.62
1923 6.62
1924 6.62
1925 6.62
1926 6.62
1927 6.61
1928 6.61
1929 6.6
1930 6.6
1931 6.59
1932 6.59
1933 6.58
1934 6.58
1935 6.57
1936 6.57
1937 6.56
1938 6.56
1939 6.55
1940 6.55
1941 6.54
1942 6.54
1943 6.53
1944 6.53
1945 6.52
1946 6.52
1947 6.51
1948 6.51
1949 6.5
1950 6.5
1951 6.51
1952 6.55
1953 6.58
1954 6.62
1955 6.66
1956 6.71
1957 6.75
1958 6.8
1959 6.84
1960 6.89
1961 6.92
1962 6.95
1963 6.98
1964 6.99
1965 6.99
1966 6.99
1967 6.98
1968 6.97
1969 6.95
1970 6.94
1971 6.91
1972 6.89
1973 6.86
1974 6.82
1975 6.77
1976 6.71
1977 6.65
1978 6.56
1979 6.47
1980 6.38
1981 6.27
1982 6.17
1983 6.08
1984 5.98
1985 5.88
1986 5.78
1987 5.68
1988 5.57
1989 5.44
1990 5.31
1991 5.16
1992 5.01
1993 4.86
1994 4.7
1995 4.54
1996 4.38
1997 4.22
1998 4.07
1999 3.91
2000 3.76
2001 3.62
2002 3.48
2003 3.36
2004 3.24
2005 3.13
2006 3.02
2007 2.93
2008 2.83
2009 2.75
2010 2.67
2011 2.59
2012 2.53
2013 2.47
2014 2.42
2015 2.37
2016 2.33
2017 2.3
2018 2.27