Year Total
1800 6.31
1801 6.31
1802 6.31
1803 6.31
1804 6.31
1805 6.31
1806 6.31
1807 6.31
1808 6.31
1809 6.31
1810 6.31
1811 6.31
1812 6.31
1813 6.31
1814 6.31
1815 6.31
1816 6.31
1817 6.31
1818 6.31
1819 6.31
1820 6.31
1821 6.31
1822 6.31
1823 6.31
1824 6.31
1825 6.31
1826 6.31
1827 6.31
1828 6.31
1829 6.31
1830 6.31
1831 6.31
1832 6.31
1833 6.31
1834 6.31
1835 6.31
1836 6.31
1837 6.31
1838 6.31
1839 6.31
1840 6.31
1841 6.31
1842 6.31
1843 6.31
1844 6.31
1845 6.31
1846 6.31
1847 6.31
1848 6.31
1849 6.31
1850 6.31
1851 6.31
1852 6.31
1853 6.31
1854 6.31
1855 6.31
1856 6.31
1857 6.31
1858 6.31
1859 6.31
1860 6.31
1861 6.31
1862 6.31
1863 6.31
1864 6.31
1865 6.31
1866 6.31
1867 6.31
1868 6.31
1869 6.31
1870 6.31
1871 6.31
1872 6.31
1873 6.31
1874 6.31
1875 6.31
1876 6.31
1877 6.31
1878 6.31
1879 6.31
1880 6.31
1881 6.31
1882 6.31
1883 6.31
1884 6.31
1885 6.31
1886 6.31
1887 6.31
1888 6.31
1889 6.31
1890 6.31
1891 6.31
1892 6.31
1893 6.31
1894 6.31
1895 6.31
1896 6.31
1897 6.31
1898 6.31
1899 6.31
1900 6.31
1901 6.31
1902 6.31
1903 6.31
1904 6.31
1905 6.31
1906 6.31
1907 6.31
1908 6.31
1909 6.31
1910 6.31
1911 6.31
1912 6.31
1913 6.31
1914 6.31
1915 6.31
1916 6.31
1917 6.31
1918 6.31
1919 6.31
1920 6.31
1921 6.31
1922 6.31
1923 6.31
1924 6.31
1925 6.31
1926 6.31
1927 6.31
1928 6.31
1929 6.31
1930 6.31
1931 6.31
1932 6.31
1933 6.31
1934 6.31
1935 6.31
1936 6.31
1937 6.31
1938 6.31
1939 6.31
1940 6.31
1941 6.31
1942 6.31
1943 6.31
1944 6.31
1945 6.31
1946 6.31
1947 6.31
1948 6.31
1949 6.31
1950 6.31
1951 6.31
1952 6.3
1953 6.3
1954 6.3
1955 6.3
1956 6.3
1957 6.31
1958 6.32
1959 6.32
1960 6.32
1961 6.32
1962 6.3
1963 6.27
1964 6.23
1965 6.18
1966 6.11
1967 6.03
1968 5.94
1969 5.85
1970 5.76
1971 5.69
1972 5.64
1973 5.62
1974 5.61
1975 5.64
1976 5.7
1977 5.78
1978 5.87
1979 5.97
1980 6.06
1981 6.12
1982 6.15
1983 6.15
1984 6.11
1985 6.03
1986 5.92
1987 5.8
1988 5.67
1989 5.55
1990 5.43
1991 5.32
1992 5.21
1993 5.1
1994 5
1995 4.89
1996 4.78
1997 4.67
1998 4.55
1999 4.43
2000 4.3
2001 4.18
2002 4.07
2003 3.96
2004 3.85
2005 3.76
2006 3.67
2007 3.58
2008 3.49
2009 3.41
2010 3.33
2011 3.25
2012 3.17
2013 3.1
2014 3.03
2015 2.97
2016 2.92
2017 2.87
2018 2.82