Year Total
1800 6.82
1801 6.82
1802 6.82
1803 6.82
1804 6.82
1805 6.82
1806 6.82
1807 6.82
1808 6.82
1809 6.82
1810 6.82
1811 6.82
1812 6.82
1813 6.82
1814 6.82
1815 6.82
1816 6.82
1817 6.82
1818 6.82
1819 6.82
1820 6.82
1821 6.82
1822 6.82
1823 6.82
1824 6.82
1825 6.82
1826 6.82
1827 6.82
1828 6.82
1829 6.82
1830 6.82
1831 6.82
1832 6.82
1833 6.82
1834 6.82
1835 6.82
1836 6.82
1837 6.82
1838 6.82
1839 6.82
1840 6.82
1841 6.82
1842 6.82
1843 6.82
1844 6.82
1845 6.82
1846 6.82
1847 6.82
1848 6.82
1849 6.82
1850 6.82
1851 6.82
1852 6.82
1853 6.82
1854 6.82
1855 6.82
1856 6.82
1857 6.82
1858 6.82
1859 6.82
1860 6.82
1861 6.82
1862 6.82
1863 6.82
1864 6.82
1865 6.82
1866 6.82
1867 6.82
1868 6.82
1869 6.82
1870 6.82
1871 6.82
1872 6.82
1873 6.82
1874 6.82
1875 6.82
1876 6.82
1877 6.82
1878 6.82
1879 6.82
1880 6.82
1881 6.82
1882 6.82
1883 6.82
1884 6.82
1885 6.82
1886 6.82
1887 6.82
1888 6.82
1889 6.82
1890 6.82
1891 6.82
1892 6.82
1893 6.82
1894 6.82
1895 6.82
1896 6.82
1897 6.82
1898 6.82
1899 6.82
1900 6.82
1901 6.81
1902 6.8
1903 6.79
1904 6.78
1905 6.77
1906 6.76
1907 6.75
1908 6.74
1909 6.73
1910 6.72
1911 6.71
1912 6.7
1913 6.69
1914 6.68
1915 6.67
1916 6.66
1917 6.65
1918 6.64
1919 6.63
1920 6.62
1921 6.61
1922 6.6
1923 6.59
1924 6.58
1925 6.57
1926 6.56
1927 6.55
1928 6.54
1929 6.53
1930 6.53
1931 6.54
1932 6.56
1933 6.58
1934 6.59
1935 6.61
1936 6.63
1937 6.65
1938 6.67
1939 6.68
1940 6.7
1941 6.72
1942 6.74
1943 6.76
1944 6.78
1945 6.8
1946 6.82
1947 6.84
1948 6.86
1949 6.88
1950 6.9
1951 6.9
1952 6.9
1953 6.91
1954 6.91
1955 6.92
1956 6.93
1957 6.94
1958 6.95
1959 6.96
1960 6.97
1961 6.97
1962 6.96
1963 6.95
1964 6.92
1965 6.88
1966 6.82
1967 6.73
1968 6.63
1969 6.51
1970 6.38
1971 6.24
1972 6.1
1973 5.96
1974 5.83
1975 5.71
1976 5.58
1977 5.45
1978 5.31
1979 5.17
1980 5.02
1981 4.88
1982 4.73
1983 4.6
1984 4.48
1985 4.36
1986 4.25
1987 4.14
1988 4.04
1989 3.93
1990 3.83
1991 3.72
1992 3.62
1993 3.51
1994 3.41
1995 3.32
1996 3.23
1997 3.14
1998 3.06
1999 2.99
2000 2.93
2001 2.87
2002 2.82
2003 2.77
2004 2.73
2005 2.68
2006 2.65
2007 2.62
2008 2.59
2009 2.57
2010 2.55
2011 2.53
2012 2.5
2013 2.48
2014 2.46
2015 2.43
2016 2.4
2017 2.37
2018 2.34