Year Total
1800 6.58
1801 6.58
1802 6.58
1803 6.58
1804 6.58
1805 6.58
1806 6.58
1807 6.58
1808 6.58
1809 6.58
1810 6.58
1811 6.58
1812 6.58
1813 6.58
1814 6.58
1815 6.58
1816 6.58
1817 6.58
1818 6.58
1819 6.58
1820 6.58
1821 6.58
1822 6.58
1823 6.58
1824 6.58
1825 6.58
1826 6.58
1827 6.58
1828 6.58
1829 6.58
1830 6.58
1831 6.58
1832 6.58
1833 6.58
1834 6.58
1835 6.58
1836 6.58
1837 6.58
1838 6.58
1839 6.58
1840 6.58
1841 6.58
1842 6.58
1843 6.58
1844 6.58
1845 6.58
1846 6.58
1847 6.58
1848 6.58
1849 6.58
1850 6.58
1851 6.58
1852 6.58
1853 6.58
1854 6.58
1855 6.58
1856 6.58
1857 6.58
1858 6.58
1859 6.58
1860 6.58
1861 6.58
1862 6.58
1863 6.58
1864 6.58
1865 6.58
1866 6.58
1867 6.58
1868 6.58
1869 6.58
1870 6.58
1871 6.58
1872 6.58
1873 6.58
1874 6.58
1875 6.58
1876 6.58
1877 6.58
1878 6.58
1879 6.58
1880 6.58
1881 6.58
1882 6.58
1883 6.58
1884 6.58
1885 6.58
1886 6.58
1887 6.58
1888 6.58
1889 6.58
1890 6.58
1891 6.58
1892 6.58
1893 6.58
1894 6.58
1895 6.58
1896 6.58
1897 6.58
1898 6.58
1899 6.58
1900 6.58
1901 6.58
1902 6.58
1903 6.58
1904 6.58
1905 6.58
1906 6.58
1907 6.58
1908 6.58
1909 6.58
1910 6.58
1911 6.58
1912 6.58
1913 6.58
1914 6.58
1915 6.58
1916 6.58
1917 6.58
1918 6.58
1919 6.58
1920 6.58
1921 6.58
1922 6.58
1923 6.58
1924 6.58
1925 6.58
1926 6.44
1927 6.29
1928 6.15
1929 6
1930 5.86
1931 5.72
1932 5.57
1933 5.42
1934 5.27
1935 5.12
1936 4.97
1937 4.82
1938 4.67
1939 4.52
1940 4.36
1941 4.35
1942 4.35
1943 4.34
1944 4.32
1945 4.31
1946 4.3
1947 4.28
1948 4.27
1949 4.25
1950 4.23
1951 4.26
1952 4.36
1953 4.49
1954 4.63
1955 4.78
1956 4.94
1957 5.1
1958 5.24
1959 5.37
1960 5.47
1961 5.52
1962 5.53
1963 5.52
1964 5.48
1965 5.42
1966 5.35
1967 5.3
1968 5.25
1969 5.21
1970 5.18
1971 5.15
1972 5.11
1973 5.05
1974 4.97
1975 4.88
1976 4.77
1977 4.66
1978 4.55
1979 4.45
1980 4.37
1981 4.3
1982 4.24
1983 4.2
1984 4.16
1985 4.13
1986 4.1
1987 4.07
1988 4.02
1989 3.96
1990 3.89
1991 3.8
1992 3.69
1993 3.57
1994 3.44
1995 3.3
1996 3.16
1997 3.02
1998 2.88
1999 2.76
2000 2.66
2001 2.58
2002 2.54
2003 2.52
2004 2.54
2005 2.58
2006 2.65
2007 2.73
2008 2.82
2009 2.91
2010 2.98
2011 3.04
2012 3.08
2013 3.09
2014 3.08
2015 3.05
2016 3.01
2017 2.96
2018 2.91