Year Total
1800 6.89
1801 6.89
1802 6.89
1803 6.89
1804 6.89
1805 6.89
1806 6.89
1807 6.89
1808 6.89
1809 6.89
1810 6.89
1811 6.89
1812 6.89
1813 6.89
1814 6.89
1815 6.89
1816 6.89
1817 6.89
1818 6.89
1819 6.89
1820 6.89
1821 6.89
1822 6.89
1823 6.89
1824 6.89
1825 6.89
1826 6.89
1827 6.89
1828 6.89
1829 6.89
1830 6.89
1831 6.89
1832 6.89
1833 6.89
1834 6.89
1835 6.89
1836 6.89
1837 6.89
1838 6.89
1839 6.89
1840 6.89
1841 6.89
1842 6.89
1843 6.89
1844 6.89
1845 6.89
1846 6.89
1847 6.89
1848 6.89
1849 6.89
1850 6.89
1851 6.89
1852 6.89
1853 6.89
1854 6.89
1855 6.89
1856 6.89
1857 6.89
1858 6.89
1859 6.89
1860 6.89
1861 6.89
1862 6.89
1863 6.89
1864 6.89
1865 6.89
1866 6.89
1867 6.89
1868 6.89
1869 6.89
1870 6.89
1871 6.89
1872 6.89
1873 6.89
1874 6.89
1875 6.89
1876 6.89
1877 6.89
1878 6.89
1879 6.89
1880 6.89
1881 6.89
1882 6.89
1883 6.89
1884 6.89
1885 6.89
1886 6.89
1887 6.89
1888 6.89
1889 6.89
1890 6.89
1891 6.89
1892 6.89
1893 6.89
1894 6.89
1895 6.89
1896 6.89
1897 6.89
1898 6.89
1899 6.89
1900 6.89
1901 6.89
1902 6.89
1903 6.89
1904 6.89
1905 6.89
1906 6.89
1907 6.89
1908 6.89
1909 6.89
1910 6.89
1911 6.89
1912 6.89
1913 6.89
1914 6.89
1915 6.89
1916 6.89
1917 6.89
1918 6.89
1919 6.89
1920 6.89
1921 6.89
1922 6.89
1923 6.89
1924 6.89
1925 6.89
1926 6.89
1927 6.89
1928 6.89
1929 6.89
1930 6.89
1931 6.89
1932 6.89
1933 6.89
1934 6.89
1935 6.89
1936 6.89
1937 6.89
1938 6.89
1939 6.89
1940 6.89
1941 6.89
1942 6.89
1943 6.89
1944 6.89
1945 6.89
1946 6.89
1947 6.89
1948 6.89
1949 6.89
1950 6.89
1951 6.89
1952 6.9
1953 6.9
1954 6.91
1955 6.92
1956 6.93
1957 6.94
1958 6.96
1959 6.98
1960 7
1961 7.02
1962 7.04
1963 7.06
1964 7.08
1965 7.09
1966 7.11
1967 7.11
1968 7.12
1969 7.12
1970 7.12
1971 7.11
1972 7.11
1973 7.1
1974 7.1
1975 7.1
1976 7.1
1977 7.1
1978 7.1
1979 7.1
1980 7.1
1981 7.1
1982 7.1
1983 7.1
1984 7.1
1985 7.1
1986 7.1
1987 7.1
1988 7.1
1989 7.1
1990 7.09
1991 7.08
1992 7.07
1993 7.06
1994 7.04
1995 7.02
1996 6.99
1997 6.97
1998 6.94
1999 6.9
2000 6.87
2001 6.82
2002 6.77
2003 6.72
2004 6.65
2005 6.58
2006 6.51
2007 6.42
2008 6.34
2009 6.25
2010 6.15
2011 6.06
2012 5.96
2013 5.87
2014 5.78
2015 5.68
2016 5.59
2017 5.5
2018 5.41