Year Total
1800 6.39
1801 6.39
1802 6.39
1803 6.39
1804 6.39
1805 6.39
1806 6.39
1807 6.39
1808 6.39
1809 6.39
1810 6.39
1811 6.39
1812 6.39
1813 6.39
1814 6.39
1815 6.39
1816 6.39
1817 6.39
1818 6.39
1819 6.39
1820 6.39
1821 6.39
1822 6.39
1823 6.39
1824 6.39
1825 6.39
1826 6.39
1827 6.39
1828 6.39
1829 6.39
1830 6.39
1831 6.39
1832 6.39
1833 6.39
1834 6.39
1835 6.39
1836 6.39
1837 6.39
1838 6.39
1839 6.39
1840 6.39
1841 6.39
1842 6.39
1843 6.39
1844 6.39
1845 6.39
1846 6.39
1847 6.39
1848 6.39
1849 6.39
1850 6.39
1851 6.39
1852 6.39
1853 6.39
1854 6.39
1855 6.39
1856 6.39
1857 6.39
1858 6.39
1859 6.39
1860 6.39
1861 6.39
1862 6.39
1863 6.39
1864 6.39
1865 6.39
1866 6.39
1867 6.39
1868 6.39
1869 6.39
1870 6.39
1871 6.39
1872 6.39
1873 6.39
1874 6.39
1875 6.39
1876 6.39
1877 6.39
1878 6.39
1879 6.39
1880 6.39
1881 6.39
1882 6.39
1883 6.39
1884 6.39
1885 6.39
1886 6.39
1887 6.39
1888 6.39
1889 6.39
1890 6.39
1891 6.39
1892 6.39
1893 6.39
1894 6.39
1895 6.39
1896 6.39
1897 6.39
1898 6.37
1899 6.34
1900 6.31
1901 6.28
1902 6.25
1903 6.22
1904 6.2
1905 6.17
1906 6.14
1907 6.11
1908 6.08
1909 6.05
1910 6.03
1911 6
1912 5.97
1913 5.94
1914 5.91
1915 5.88
1916 5.86
1917 5.83
1918 5.8
1919 5.77
1920 5.74
1921 5.71
1922 5.69
1923 5.66
1924 5.63
1925 5.6
1926 5.57
1927 5.42
1928 5.26
1929 5.1
1930 4.95
1931 4.79
1932 4.63
1933 4.48
1934 4.32
1935 4.17
1936 4.01
1937 3.85
1938 3.7
1939 3.54
1940 3.38
1941 3.39
1942 3.4
1943 3.41
1944 3.42
1945 3.43
1946 3.44
1947 3.45
1948 3.46
1949 3.47
1950 3.48
1951 3.49
1952 3.5
1953 3.51
1954 3.51
1955 3.5
1956 3.49
1957 3.46
1958 3.43
1959 3.38
1960 3.33
1961 3.26
1962 3.18
1963 3.09
1964 2.99
1965 2.89
1966 2.8
1967 2.72
1968 2.66
1969 2.61
1970 2.58
1971 2.56
1972 2.54
1973 2.52
1974 2.5
1975 2.48
1976 2.47
1977 2.46
1978 2.45
1979 2.46
1980 2.48
1981 2.51
1982 2.55
1983 2.59
1984 2.62
1985 2.64
1986 2.65
1987 2.63
1988 2.58
1989 2.51
1990 2.41
1991 2.31
1992 2.2
1993 2.09
1994 1.99
1995 1.9
1996 1.81
1997 1.72
1998 1.62
1999 1.53
2000 1.44
2001 1.35
2002 1.29
2003 1.25
2004 1.22
2005 1.22
2006 1.23
2007 1.24
2008 1.26
2009 1.27
2010 1.27
2011 1.27
2012 1.27
2013 1.26
2014 1.26
2015 1.25
2016 1.24
2017 1.23
2018 1.23