Year Total
1800 6.16
1801 6.16
1802 6.16
1803 6.16
1804 6.16
1805 6.16
1806 6.16
1807 6.16
1808 6.16
1809 6.16
1810 6.16
1811 6.16
1812 6.16
1813 6.16
1814 6.16
1815 6.16
1816 6.16
1817 6.16
1818 6.16
1819 6.16
1820 6.16
1821 6.16
1822 6.16
1823 6.16
1824 6.16
1825 6.16
1826 6.16
1827 6.16
1828 6.16
1829 6.16
1830 6.16
1831 6.16
1832 6.16
1833 6.16
1834 6.16
1835 6.16
1836 6.16
1837 6.16
1838 6.16
1839 6.16
1840 6.16
1841 6.16
1842 6.16
1843 6.16
1844 6.16
1845 6.16
1846 6.16
1847 6.16
1848 6.16
1849 6.16
1850 6.16
1851 6.16
1852 6.16
1853 6.16
1854 6.16
1855 6.16
1856 6.16
1857 6.16
1858 6.16
1859 6.16
1860 6.16
1861 6.16
1862 6.16
1863 6.16
1864 6.16
1865 6.16
1866 6.16
1867 6.16
1868 6.16
1869 6.16
1870 6.16
1871 6.16
1872 6.16
1873 6.16
1874 6.16
1875 6.16
1876 6.16
1877 6.16
1878 6.16
1879 6.16
1880 6.16
1881 6.16
1882 6.16
1883 6.16
1884 6.16
1885 6.16
1886 6.16
1887 6.16
1888 6.16
1889 6.16
1890 6.16
1891 6.16
1892 6.16
1893 6.16
1894 6.16
1895 6.16
1896 6.16
1897 6.16
1898 6.16
1899 6.16
1900 6.16
1901 6.16
1902 6.16
1903 6.16
1904 6.16
1905 6.16
1906 6.16
1907 6.16
1908 6.16
1909 6.16
1910 6.16
1911 6.16
1912 6.16
1913 6.16
1914 6.16
1915 6.16
1916 6.16
1917 6.16
1918 6.16
1919 6.16
1920 6.16
1921 6.16
1922 6.16
1923 6.16
1924 6.16
1925 6.16
1926 6.16
1927 6.16
1928 6.16
1929 6.16
1930 6.16
1931 6.16
1932 6.16
1933 6.16
1934 6.16
1935 6.16
1936 6.21
1937 6.26
1938 6.31
1939 6.36
1940 6.4
1941 6.45
1942 6.5
1943 6.55
1944 6.6
1945 6.64
1946 6.69
1947 6.74
1948 6.79
1949 6.84
1950 6.88
1951 6.98
1952 7.16
1953 7.3
1954 7.4
1955 7.47
1956 7.5
1957 7.5
1958 7.46
1959 7.41
1960 7.34
1961 7.26
1962 7.18
1963 7.11
1964 7.05
1965 7.01
1966 6.98
1967 6.96
1968 6.94
1969 6.92
1970 6.89
1971 6.86
1972 6.81
1973 6.75
1974 6.68
1975 6.6
1976 6.51
1977 6.42
1978 6.33
1979 6.23
1980 6.13
1981 6.02
1982 5.9
1983 5.76
1984 5.61
1985 5.45
1986 5.28
1987 5.1
1988 4.93
1989 4.76
1990 4.6
1991 4.43
1992 4.27
1993 4.11
1994 3.94
1995 3.78
1996 3.62
1997 3.47
1998 3.33
1999 3.2
2000 3.08
2001 2.98
2002 2.89
2003 2.81
2004 2.74
2005 2.68
2006 2.62
2007 2.57
2008 2.52
2009 2.48
2010 2.43
2011 2.38
2012 2.34
2013 2.3
2014 2.26
2015 2.23
2016 2.2
2017 2.17
2018 2.14