Year Total
1800 6.48
1801 6.48
1802 6.48
1803 6.48
1804 6.48
1805 6.48
1806 6.48
1807 6.48
1808 6.48
1809 6.48
1810 6.48
1811 6.48
1812 6.48
1813 6.48
1814 6.48
1815 6.48
1816 6.48
1817 6.48
1818 6.48
1819 6.48
1820 6.48
1821 6.48
1822 6.48
1823 6.48
1824 6.48
1825 6.48
1826 6.48
1827 6.48
1828 6.48
1829 6.48
1830 6.48
1831 6.48
1832 6.48
1833 6.48
1834 6.48
1835 6.48
1836 6.48
1837 6.48
1838 6.48
1839 6.48
1840 6.48
1841 6.48
1842 6.48
1843 6.48
1844 6.48
1845 6.48
1846 6.48
1847 6.48
1848 6.48
1849 6.48
1850 6.48
1851 6.48
1852 6.48
1853 6.48
1854 6.48
1855 6.48
1856 6.48
1857 6.48
1858 6.48
1859 6.48
1860 6.48
1861 6.48
1862 6.48
1863 6.48
1864 6.48
1865 6.48
1866 6.48
1867 6.48
1868 6.48
1869 6.48
1870 6.48
1871 6.48
1872 6.48
1873 6.48
1874 6.48
1875 6.48
1876 6.48
1877 6.48
1878 6.48
1879 6.48
1880 6.48
1881 6.48
1882 6.48
1883 6.48
1884 6.48
1885 6.48
1886 6.48
1887 6.48
1888 6.48
1889 6.48
1890 6.48
1891 6.48
1892 6.48
1893 6.48
1894 6.48
1895 6.48
1896 6.48
1897 6.48
1898 6.48
1899 6.48
1900 6.48
1901 6.48
1902 6.48
1903 6.48
1904 6.48
1905 6.48
1906 6.48
1907 6.48
1908 6.48
1909 6.48
1910 6.48
1911 6.48
1912 6.48
1913 6.48
1914 6.48
1915 6.48
1916 6.48
1917 6.48
1918 6.48
1919 6.48
1920 6.48
1921 6.48
1922 6.48
1923 6.48
1924 6.48
1925 6.48
1926 6.48
1927 6.48
1928 6.48
1929 6.48
1930 6.48
1931 6.49
1932 6.5
1933 6.52
1934 6.53
1935 6.54
1936 6.55
1937 6.56
1938 6.57
1939 6.59
1940 6.6
1941 6.61
1942 6.62
1943 6.63
1944 6.65
1945 6.66
1946 6.67
1947 6.68
1948 6.69
1949 6.7
1950 6.72
1951 6.73
1952 6.75
1953 6.76
1954 6.77
1955 6.77
1956 6.77
1957 6.75
1958 6.74
1959 6.72
1960 6.7
1961 6.67
1962 6.65
1963 6.63
1964 6.61
1965 6.59
1966 6.59
1967 6.59
1968 6.59
1969 6.59
1970 6.58
1971 6.55
1972 6.5
1973 6.42
1974 6.31
1975 6.18
1976 6.04
1977 5.9
1978 5.76
1979 5.63
1980 5.52
1981 5.42
1982 5.34
1983 5.26
1984 5.19
1985 5.13
1986 5.07
1987 5.03
1988 4.99
1989 4.95
1990 4.91
1991 4.87
1992 4.81
1993 4.74
1994 4.66
1995 4.58
1996 4.47
1997 4.37
1998 4.27
1999 4.16
2000 4.06
2001 3.96
2002 3.87
2003 3.77
2004 3.68
2005 3.6
2006 3.51
2007 3.43
2008 3.35
2009 3.27
2010 3.2
2011 3.13
2012 3.07
2013 3.02
2014 2.97
2015 2.92
2016 2.88
2017 2.84
2018 2.8