Year Total
1800 6.45
1801 6.45
1802 6.45
1803 6.45
1804 6.45
1805 6.45
1806 6.45
1807 6.45
1808 6.45
1809 6.45
1810 6.45
1811 6.45
1812 6.45
1813 6.45
1814 6.45
1815 6.45
1816 6.45
1817 6.45
1818 6.45
1819 6.45
1820 6.45
1821 6.45
1822 6.45
1823 6.45
1824 6.45
1825 6.45
1826 6.45
1827 6.45
1828 6.45
1829 6.45
1830 6.45
1831 6.45
1832 6.45
1833 6.45
1834 6.45
1835 6.45
1836 6.45
1837 6.45
1838 6.45
1839 6.45
1840 6.45
1841 6.45
1842 6.45
1843 6.45
1844 6.45
1845 6.45
1846 6.45
1847 6.45
1848 6.45
1849 6.45
1850 6.45
1851 6.45
1852 6.45
1853 6.45
1854 6.45
1855 6.45
1856 6.45
1857 6.45
1858 6.45
1859 6.45
1860 6.45
1861 6.45
1862 6.45
1863 6.45
1864 6.45
1865 6.45
1866 6.45
1867 6.45
1868 6.45
1869 6.45
1870 6.45
1871 6.45
1872 6.45
1873 6.45
1874 6.45
1875 6.45
1876 6.45
1877 6.45
1878 6.45
1879 6.45
1880 6.45
1881 6.45
1882 6.45
1883 6.45
1884 6.45
1885 6.45
1886 6.45
1887 6.45
1888 6.45
1889 6.45
1890 6.45
1891 6.45
1892 6.45
1893 6.45
1894 6.45
1895 6.45
1896 6.45
1897 6.45
1898 6.45
1899 6.45
1900 6.45
1901 6.39
1902 6.34
1903 6.28
1904 6.23
1905 6.17
1906 6.12
1907 6.06
1908 6.14
1909 6.23
1910 6.31
1911 6.39
1912 6.48
1913 6.38
1914 6.29
1915 6.19
1916 6.1
1917 6
1918 6.15
1919 6.29
1920 6.43
1921 6.57
1922 6.71
1923 6.74
1924 6.76
1925 6.79
1926 6.81
1927 6.84
1928 6.76
1929 6.67
1930 6.59
1931 6.51
1932 6.42
1933 6.37
1934 6.31
1935 6.25
1936 6.2
1937 6.14
1938 6.17
1939 6.19
1940 6.22
1941 6.24
1942 6.27
1943 6.37
1944 6.48
1945 6.59
1946 6.69
1947 6.8
1948 6.93
1949 7.07
1950 7.2
1951 7.16
1952 7.09
1953 7.04
1954 7
1955 6.97
1956 6.95
1957 6.94
1958 6.92
1959 6.91
1960 6.9
1961 6.86
1962 6.82
1963 6.79
1964 6.77
1965 6.74
1966 6.72
1967 6.71
1968 6.69
1969 6.66
1970 6.64
1971 6.62
1972 6.6
1973 6.58
1974 6.56
1975 6.54
1976 6.51
1977 6.48
1978 6.44
1979 6.4
1980 6.34
1981 6.27
1982 6.19
1983 6.09
1984 5.98
1985 5.87
1986 5.76
1987 5.66
1988 5.57
1989 5.5
1990 5.44
1991 5.38
1992 5.32
1993 5.25
1994 5.17
1995 5.09
1996 4.99
1997 4.9
1998 4.8
1999 4.7
2000 4.6
2001 4.49
2002 4.37
2003 4.25
2004 4.11
2005 3.97
2006 3.83
2007 3.7
2008 3.58
2009 3.47
2010 3.38
2011 3.29
2012 3.22
2013 3.15
2014 3.09
2015 3.03
2016 2.97
2017 2.92
2018 2.87