Year Total
1800 6.93
1801 6.93
1802 6.93
1803 6.93
1804 6.93
1805 6.93
1806 6.93
1807 6.93
1808 6.93
1809 6.93
1810 6.93
1811 6.93
1812 6.93
1813 6.93
1814 6.93
1815 6.93
1816 6.93
1817 6.93
1818 6.93
1819 6.93
1820 6.93
1821 6.93
1822 6.93
1823 6.93
1824 6.93
1825 6.93
1826 6.93
1827 6.93
1828 6.93
1829 6.93
1830 6.93
1831 6.93
1832 6.93
1833 6.93
1834 6.93
1835 6.93
1836 6.93
1837 6.93
1838 6.93
1839 6.93
1840 6.93
1841 6.93
1842 6.93
1843 6.93
1844 6.93
1845 6.93
1846 6.93
1847 6.93
1848 6.93
1849 6.93
1850 6.93
1851 6.93
1852 6.93
1853 6.93
1854 6.93
1855 6.93
1856 6.93
1857 6.93
1858 6.93
1859 6.93
1860 6.93
1861 6.93
1862 6.93
1863 6.93
1864 6.93
1865 6.93
1866 6.93
1867 6.93
1868 6.93
1869 6.93
1870 6.93
1871 6.93
1872 6.93
1873 6.93
1874 6.93
1875 6.93
1876 6.93
1877 6.93
1878 6.93
1879 6.93
1880 6.93
1881 6.93
1882 6.93
1883 6.92
1884 6.92
1885 6.92
1886 6.92
1887 6.91
1888 6.91
1889 6.91
1890 6.91
1891 6.9
1892 6.9
1893 6.92
1894 6.94
1895 6.96
1896 6.98
1897 7.01
1898 7.01
1899 7.02
1900 7.02
1901 7.03
1902 7.04
1903 7.07
1904 7.11
1905 7.15
1906 7.19
1907 7.23
1908 7.25
1909 7.27
1910 7.29
1911 7.31
1912 7.34
1913 7.21
1914 7.08
1915 6.96
1916 6.83
1917 6.71
1918 6.71
1919 6.72
1920 6.72
1921 6.73
1922 6.74
1923 6.77
1924 6.81
1925 6.85
1926 6.89
1927 6.93
1928 6.88
1929 6.83
1930 6.79
1931 6.74
1932 6.69
1933 6.64
1934 6.6
1935 6.55
1936 6.5
1937 6.45
1938 6.53
1939 6.61
1940 6.69
1941 6.71
1942 6.73
1943 6.75
1944 6.77
1945 6.78
1946 6.66
1947 6.53
1948 6.41
1949 6.28
1950 6.15
1951 6.17
1952 6.25
1953 6.33
1954 6.4
1955 6.47
1956 6.51
1957 6.54
1958 6.55
1959 6.52
1960 6.45
1961 6.41
1962 6.32
1963 6.2
1964 6.04
1965 5.85
1966 5.63
1967 5.38
1968 5.12
1969 4.86
1970 4.61
1971 4.39
1972 4.19
1973 4.03
1974 3.9
1975 3.81
1976 3.74
1977 3.7
1978 3.66
1979 3.62
1980 3.59
1981 3.55
1982 3.52
1983 3.48
1984 3.45
1985 3.41
1986 3.37
1987 3.33
1988 3.28
1989 3.23
1990 3.17
1991 3.11
1992 3.04
1993 2.97
1994 2.9
1995 2.82
1996 2.74
1997 2.65
1998 2.56
1999 2.46
2000 2.37
2001 2.29
2002 2.22
2003 2.16
2004 2.11
2005 2.07
2006 2.03
2007 2.01
2008 1.98
2009 1.95
2010 1.92
2011 1.89
2012 1.87
2013 1.84
2014 1.82
2015 1.8
2016 1.78
2017 1.77
2018 1.75