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 6.91
1927 6.92
1928 6.94
1929 6.96
1930 6.97
1931 6.99
1932 7
1933 7.02
1934 7.04
1935 7.05
1936 7.07
1937 7.09
1938 7.1
1939 7.12
1940 7.14
1941 7.15
1942 7.17
1943 7.19
1944 7.2
1945 7.22
1946 7.23
1947 7.25
1948 7.27
1949 7.28
1950 7.3
1951 7.3
1952 7.3
1953 7.3
1954 7.3
1955 7.3
1956 7.3
1957 7.3
1958 7.3
1959 7.3
1960 7.3
1961 7.3
1962 7.3
1963 7.31
1964 7.31
1965 7.31
1966 7.31
1967 7.3
1968 7.3
1969 7.29
1970 7.27
1971 7.25
1972 7.22
1973 7.19
1974 7.15
1975 7.1
1976 7.04
1977 6.98
1978 6.9
1979 6.81
1980 6.73
1981 6.64
1982 6.55
1983 6.48
1984 6.41
1985 6.35
1986 6.31
1987 6.27
1988 6.24
1989 6.21
1990 6.18
1991 6.15
1992 6.12
1993 6.08
1994 6.03
1995 5.98
1996 5.91
1997 5.84
1998 5.75
1999 5.65
2000 5.55
2001 5.45
2002 5.34
2003 5.24
2004 5.14
2005 5.05
2006 4.96
2007 4.87
2008 4.78
2009 4.69
2010 4.6
2011 4.52
2012 4.44
2013 4.37
2014 4.3
2015 4.24
2016 4.18
2017 4.13
2018 4.08