Year Total
1800 6.34
1801 6.34
1802 6.34
1803 6.34
1804 6.34
1805 6.34
1806 6.34
1807 6.34
1808 6.34
1809 6.34
1810 6.34
1811 6.34
1812 6.34
1813 6.34
1814 6.34
1815 6.34
1816 6.34
1817 6.34
1818 6.34
1819 6.34
1820 6.34
1821 6.34
1822 6.34
1823 6.34
1824 6.34
1825 6.34
1826 6.34
1827 6.34
1828 6.34
1829 6.34
1830 6.34
1831 6.34
1832 6.34
1833 6.34
1834 6.34
1835 6.34
1836 6.34
1837 6.34
1838 6.34
1839 6.34
1840 6.34
1841 6.34
1842 6.34
1843 6.34
1844 6.34
1845 6.34
1846 6.34
1847 6.34
1848 6.34
1849 6.34
1850 6.34
1851 6.34
1852 6.34
1853 6.34
1854 6.34
1855 6.34
1856 6.34
1857 6.34
1858 6.34
1859 6.34
1860 6.34
1861 6.34
1862 6.34
1863 6.34
1864 6.34
1865 6.34
1866 6.34
1867 6.34
1868 6.34
1869 6.34
1870 6.34
1871 6.34
1872 6.34
1873 6.34
1874 6.34
1875 6.34
1876 6.34
1877 6.34
1878 6.34
1879 6.34
1880 6.34
1881 6.34
1882 6.34
1883 6.34
1884 6.34
1885 6.34
1886 6.34
1887 6.34
1888 6.34
1889 6.34
1890 6.34
1891 6.34
1892 6.34
1893 6.34
1894 6.34
1895 6.34
1896 6.34
1897 6.34
1898 6.34
1899 6.34
1900 6.34
1901 6.34
1902 6.34
1903 6.34
1904 6.34
1905 6.34
1906 6.34
1907 6.34
1908 6.34
1909 6.34
1910 6.34
1911 6.34
1912 6.34
1913 6.34
1914 6.34
1915 6.34
1916 6.34
1917 6.34
1918 6.34
1919 6.34
1920 6.34
1921 6.34
1922 6.34
1923 6.34
1924 6.34
1925 6.34
1926 6.34
1927 6.34
1928 6.34
1929 6.34
1930 6.34
1931 6.34
1932 6.34
1933 6.34
1934 6.34
1935 6.34
1936 6.34
1937 6.34
1938 6.34
1939 6.34
1940 6.34
1941 6.34
1942 6.34
1943 6.34
1944 6.34
1945 6.34
1946 6.34
1947 6.34
1948 6.34
1949 6.34
1950 6.34
1951 6.33
1952 6.33
1953 6.33
1954 6.34
1955 6.36
1956 6.38
1957 6.4
1958 6.44
1959 6.48
1960 6.52
1961 6.57
1962 6.62
1963 6.68
1964 6.73
1965 6.79
1966 6.85
1967 6.91
1968 6.97
1969 7.03
1970 7.08
1971 7.14
1972 7.18
1973 7.22
1974 7.25
1975 7.28
1976 7.29
1977 7.28
1978 7.27
1979 7.25
1980 7.21
1981 7.16
1982 7.1
1983 7.03
1984 6.95
1985 6.87
1986 6.78
1987 6.67
1988 6.56
1989 6.44
1990 6.32
1991 6.2
1992 6.08
1993 5.97
1994 5.86
1995 5.76
1996 5.67
1997 5.59
1998 5.52
1999 5.46
2000 5.41
2001 5.36
2002 5.32
2003 5.28
2004 5.23
2005 5.18
2006 5.12
2007 5.06
2008 5
2009 4.94
2010 4.87
2011 4.8
2012 4.73
2013 4.66
2014 4.59
2015 4.52
2016 4.45
2017 4.38
2018 4.32