Year Total
1800 6.54
1801 6.54
1802 6.54
1803 6.54
1804 6.54
1805 6.54
1806 6.54
1807 6.54
1808 6.54
1809 6.54
1810 6.54
1811 6.54
1812 6.54
1813 6.54
1814 6.54
1815 6.54
1816 6.54
1817 6.54
1818 6.54
1819 6.54
1820 6.54
1821 6.54
1822 6.54
1823 6.54
1824 6.54
1825 6.54
1826 6.54
1827 6.54
1828 6.54
1829 6.54
1830 6.54
1831 6.54
1832 6.54
1833 6.54
1834 6.54
1835 6.54
1836 6.54
1837 6.54
1838 6.54
1839 6.54
1840 6.54
1841 6.54
1842 6.54
1843 6.54
1844 6.54
1845 6.54
1846 6.54
1847 6.54
1848 6.54
1849 6.54
1850 6.54
1851 6.54
1852 6.54
1853 6.54
1854 6.54
1855 6.54
1856 6.54
1857 6.54
1858 6.54
1859 6.54
1860 6.54
1861 6.54
1862 6.54
1863 6.54
1864 6.54
1865 6.54
1866 6.54
1867 6.54
1868 6.54
1869 6.54
1870 6.54
1871 6.54
1872 6.54
1873 6.54
1874 6.54
1875 6.54
1876 6.54
1877 6.54
1878 6.54
1879 6.54
1880 6.54
1881 6.54
1882 6.54
1883 6.54
1884 6.54
1885 6.54
1886 6.54
1887 6.54
1888 6.54
1889 6.54
1890 6.54
1891 6.54
1892 6.54
1893 6.54
1894 6.54
1895 6.54
1896 6.54
1897 6.54
1898 6.54
1899 6.54
1900 6.54
1901 6.54
1902 6.54
1903 6.54
1904 6.54
1905 6.54
1906 6.54
1907 6.54
1908 6.54
1909 6.54
1910 6.54
1911 6.54
1912 6.54
1913 6.54
1914 6.54
1915 6.54
1916 6.54
1917 6.54
1918 6.54
1919 6.54
1920 6.54
1921 6.54
1922 6.54
1923 6.54
1924 6.54
1925 6.54
1926 6.57
1927 6.6
1928 6.63
1929 6.65
1930 6.68
1931 6.71
1932 6.74
1933 6.77
1934 6.8
1935 6.83
1936 6.86
1937 6.88
1938 6.91
1939 6.94
1940 6.97
1941 7
1942 7.03
1943 7.06
1944 7.08
1945 7.11
1946 7.14
1947 7.17
1948 7.2
1949 7.23
1950 7.26
1951 7.28
1952 7.32
1953 7.36
1954 7.37
1955 7.38
1956 7.37
1957 7.35
1958 7.32
1959 7.28
1960 7.22
1961 7.16
1962 7.07
1963 6.98
1964 6.88
1965 6.76
1966 6.63
1967 6.49
1968 6.35
1969 6.19
1970 6.01
1971 5.83
1972 5.63
1973 5.42
1974 5.2
1975 4.97
1976 4.75
1977 4.54
1978 4.34
1979 4.15
1980 3.99
1981 3.83
1982 3.69
1983 3.56
1984 3.44
1985 3.33
1986 3.23
1987 3.14
1988 3.07
1989 3.01
1990 2.96
1991 2.91
1992 2.86
1993 2.81
1994 2.76
1995 2.7
1996 2.64
1997 2.58
1998 2.51
1999 2.44
2000 2.38
2001 2.32
2002 2.27
2003 2.23
2004 2.2
2005 2.17
2006 2.15
2007 2.13
2008 2.11
2009 2.09
2010 2.07
2011 2.05
2012 2.02
2013 2
2014 1.98
2015 1.95
2016 1.93
2017 1.91
2018 1.89