Year Total
1800 6.98
1801 6.98
1802 6.98
1803 6.98
1804 6.98
1805 6.98
1806 6.98
1807 6.98
1808 6.98
1809 6.98
1810 6.98
1811 6.98
1812 6.98
1813 6.98
1814 6.98
1815 6.98
1816 6.98
1817 6.98
1818 6.99
1819 6.99
1820 6.99
1821 6.99
1822 6.99
1823 6.99
1824 6.99
1825 6.99
1826 6.99
1827 6.99
1828 6.99
1829 6.99
1830 6.99
1831 6.99
1832 6.99
1833 6.99
1834 6.99
1835 6.99
1836 6.99
1837 6.99
1838 6.99
1839 6.99
1840 6.99
1841 6.99
1842 6.99
1843 6.99
1844 6.99
1845 6.99
1846 6.99
1847 6.99
1848 6.99
1849 6.99
1850 6.99
1851 6.99
1852 6.99
1853 6.99
1854 7
1855 7
1856 7
1857 7
1858 7
1859 7
1860 7
1861 7
1862 7
1863 7
1864 7
1865 7
1866 7
1867 7
1868 7
1869 7
1870 7
1871 7
1872 7
1873 7
1874 7
1875 7
1876 7
1877 7
1878 7
1879 7
1880 7
1881 7
1882 7
1883 7
1884 7
1885 7
1886 7
1887 7
1888 7
1889 7
1890 7.01
1891 7.01
1892 7.01
1893 7.01
1894 7.01
1895 7.01
1896 7.01
1897 7.01
1898 7.01
1899 7.01
1900 7.01
1901 7
1902 6.98
1903 6.97
1904 6.96
1905 6.94
1906 6.93
1907 6.92
1908 6.9
1909 6.89
1910 6.88
1911 6.87
1912 6.85
1913 6.84
1914 6.83
1915 6.81
1916 6.8
1917 6.79
1918 6.82
1919 6.86
1920 6.89
1921 6.93
1922 6.96
1923 7.01
1924 7.05
1925 7.09
1926 7.13
1927 7.17
1928 7.15
1929 7.13
1930 7.12
1931 7.1
1932 7.08
1933 7.06
1934 7.03
1935 7.01
1936 6.99
1937 6.97
1938 6.92
1939 6.87
1940 6.82
1941 6.77
1942 6.72
1943 6.72
1944 6.72
1945 6.72
1946 6.72
1947 6.71
1948 6.71
1949 6.71
1950 6.7
1951 6.71
1952 6.73
1953 6.74
1954 6.75
1955 6.75
1956 6.75
1957 6.75
1958 6.75
1959 6.73
1960 6.72
1961 6.7
1962 6.68
1963 6.65
1964 6.61
1965 6.56
1966 6.51
1967 6.44
1968 6.35
1969 6.25
1970 6.14
1971 6.01
1972 5.87
1973 5.73
1974 5.58
1975 5.43
1976 5.28
1977 5.13
1978 4.99
1979 4.85
1980 4.73
1981 4.61
1982 4.5
1983 4.4
1984 4.31
1985 4.21
1986 4.12
1987 4.03
1988 3.95
1989 3.86
1990 3.77
1991 3.68
1992 3.59
1993 3.51
1994 3.44
1995 3.36
1996 3.29
1997 3.23
1998 3.16
1999 3.09
2000 3.03
2001 2.97
2002 2.91
2003 2.87
2004 2.83
2005 2.79
2006 2.76
2007 2.74
2008 2.71
2009 2.68
2010 2.66
2011 2.63
2012 2.6
2013 2.57
2014 2.54
2015 2.51
2016 2.49
2017 2.46
2018 2.43