Year Total
1800 5.9
1801 5.9
1802 5.9
1803 5.9
1804 5.9
1805 5.9
1806 5.9
1807 5.9
1808 5.9
1809 5.9
1810 5.9
1811 5.9
1812 5.9
1813 5.9
1814 5.9
1815 5.9
1816 5.9
1817 5.9
1818 5.9
1819 5.9
1820 5.9
1821 5.9
1822 5.9
1823 5.9
1824 5.9
1825 5.9
1826 5.9
1827 5.9
1828 5.9
1829 5.9
1830 5.9
1831 5.9
1832 5.9
1833 5.9
1834 5.9
1835 5.9
1836 5.9
1837 5.9
1838 5.9
1839 5.9
1840 5.9
1841 5.9
1842 5.9
1843 5.9
1844 5.9
1845 5.9
1846 5.9
1847 5.9
1848 5.9
1849 5.9
1850 5.9
1851 5.86
1852 5.82
1853 5.78
1854 5.73
1855 5.69
1856 5.65
1857 5.61
1858 5.57
1859 5.53
1860 5.48
1861 5.44
1862 5.4
1863 5.4
1864 5.39
1865 5.39
1866 5.38
1867 5.38
1868 5.38
1869 5.37
1870 5.37
1871 5.36
1872 5.36
1873 5.35
1874 5.35
1875 5.35
1876 5.34
1877 5.34
1878 5.33
1879 5.33
1880 5.33
1881 5.32
1882 5.32
1883 5.31
1884 5.31
1885 5.3
1886 5.3
1887 5.3
1888 5.29
1889 5.29
1890 5.28
1891 5.28
1892 5.28
1893 5.27
1894 5.27
1895 5.26
1896 5.26
1897 5.25
1898 5.25
1899 5.25
1900 5.24
1901 5.24
1902 5.23
1903 5.23
1904 5.23
1905 5.22
1906 5.22
1907 5.21
1908 5.21
1909 5.2
1910 5.2
1911 5.17
1912 5.14
1913 5.12
1914 5.09
1915 5.06
1916 5.03
1917 5
1918 4.98
1919 4.95
1920 4.92
1921 4.89
1922 4.86
1923 4.84
1924 4.81
1925 4.78
1926 4.75
1927 4.72
1928 4.7
1929 4.67
1930 4.64
1931 4.61
1932 4.59
1933 4.56
1934 4.54
1935 4.52
1936 4.5
1937 4.48
1938 4.46
1939 4.44
1940 4.42
1941 4.41
1942 4.4
1943 4.38
1944 4.37
1945 4.36
1946 4.35
1947 4.34
1948 4.33
1949 4.33
1950 4.32
1951 4.31
1952 4.24
1953 4.17
1954 4.09
1955 4.01
1956 3.92
1957 3.84
1958 3.76
1959 3.68
1960 3.6
1961 3.52
1962 3.44
1963 3.34
1964 3.25
1965 3.15
1966 3.05
1967 2.95
1968 2.87
1969 2.8
1970 2.74
1971 2.68
1972 2.62
1973 2.57
1974 2.51
1975 2.45
1976 2.39
1977 2.34
1978 2.3
1979 2.27
1980 2.24
1981 2.22
1982 2.21
1983 2.19
1984 2.18
1985 2.16
1986 2.14
1987 2.12
1988 2.1
1989 2.09
1990 2.08
1991 2.06
1992 2.05
1993 2.03
1994 2
1995 1.98
1996 1.95
1997 1.93
1998 1.91
1999 1.89
2000 1.88
2001 1.87
2002 1.86
2003 1.85
2004 1.85
2005 1.84
2006 1.83
2007 1.82
2008 1.81
2009 1.79
2010 1.77
2011 1.75
2012 1.73
2013 1.71
2014 1.69
2015 1.68
2016 1.67
2017 1.66
2018 1.65