Year Total
1800 6.93
1801 6.93
1802 6.93
1803 6.93
1804 6.93
1805 6.93
1806 6.93
1807 6.94
1808 6.94
1809 6.94
1810 6.94
1811 6.94
1812 6.94
1813 6.94
1814 6.94
1815 6.94
1816 6.94
1817 6.94
1818 6.94
1819 6.94
1820 6.94
1821 6.95
1822 6.95
1823 6.95
1824 6.95
1825 6.95
1826 6.95
1827 6.95
1828 6.95
1829 6.95
1830 6.95
1831 6.95
1832 6.95
1833 6.95
1834 6.95
1835 6.96
1836 6.96
1837 6.96
1838 6.96
1839 6.96
1840 6.96
1841 6.96
1842 6.96
1843 6.96
1844 6.96
1845 6.96
1846 6.96
1847 6.96
1848 6.96
1849 6.97
1850 6.97
1851 6.97
1852 6.97
1853 6.97
1854 6.97
1855 6.97
1856 6.97
1857 6.97
1858 6.97
1859 6.97
1860 6.97
1861 6.97
1862 6.97
1863 6.98
1864 6.98
1865 6.98
1866 6.98
1867 6.98
1868 6.98
1869 6.98
1870 6.98
1871 6.98
1872 6.98
1873 6.98
1874 6.98
1875 6.98
1876 6.98
1877 6.99
1878 6.99
1879 6.99
1880 6.99
1881 6.99
1882 6.99
1883 6.99
1884 6.99
1885 6.99
1886 6.99
1887 6.99
1888 6.99
1889 6.99
1890 6.99
1891 7
1892 7
1893 7
1894 7
1895 7
1896 7
1897 7
1898 7
1899 7
1900 7
1901 7
1902 7
1903 7
1904 7
1905 7.01
1906 7.01
1907 7.01
1908 7.01
1909 7.01
1910 7.01
1911 7.01
1912 7.01
1913 7.01
1914 7.01
1915 7.01
1916 7.01
1917 7.01
1918 7.01
1919 7.02
1920 7.02
1921 7.02
1922 7.02
1923 7.02
1924 7.02
1925 7.02
1926 7.02
1927 7.01
1928 7.01
1929 7
1930 7
1931 7
1932 7
1933 6.99
1934 6.99
1935 6.99
1936 7
1937 7
1938 7
1939 7
1940 7.01
1941 7.02
1942 7.02
1943 7.03
1944 7.04
1945 7.05
1946 7.06
1947 7.07
1948 7.08
1949 7.1
1950 7.11
1951 7.13
1952 7.15
1953 7.17
1954 7.2
1955 7.23
1956 7.27
1957 7.31
1958 7.36
1959 7.42
1960 7.48
1961 7.52
1962 7.56
1963 7.59
1964 7.61
1965 7.62
1966 7.62
1967 7.61
1968 7.61
1969 7.6
1970 7.6
1971 7.6
1972 7.61
1973 7.61
1974 7.61
1975 7.62
1976 7.61
1977 7.59
1978 7.57
1979 7.54
1980 7.5
1981 7.47
1982 7.44
1983 7.41
1984 7.39
1985 7.38
1986 7.37
1987 7.35
1988 7.32
1989 7.29
1990 7.25
1991 7.19
1992 7.13
1993 7.06
1994 6.99
1995 6.92
1996 6.85
1997 6.79
1998 6.73
1999 6.68
2000 6.64
2001 6.6
2002 6.57
2003 6.54
2004 6.5
2005 6.47
2006 6.42
2007 6.37
2008 6.31
2009 6.24
2010 6.16
2011 6.08
2012 6
2013 5.92
2014 5.84
2015 5.77
2016 5.69
2017 5.62
2018 5.55