Year Total
1800 5.8
1801 5.8
1802 5.8
1803 5.8
1804 5.8
1805 5.8
1806 5.8
1807 5.8
1808 5.8
1809 5.8
1810 5.8
1811 5.8
1812 5.8
1813 5.8
1814 5.8
1815 5.8
1816 5.8
1817 5.8
1818 5.8
1819 5.8
1820 5.8
1821 5.8
1822 5.8
1823 5.8
1824 5.8
1825 5.8
1826 5.8
1827 5.8
1828 5.8
1829 5.8
1830 5.8
1831 5.8
1832 5.8
1833 5.8
1834 5.8
1835 5.8
1836 5.8
1837 5.8
1838 5.8
1839 5.8
1840 5.8
1841 5.8
1842 5.8
1843 5.8
1844 5.8
1845 5.8
1846 5.8
1847 5.8
1848 5.8
1849 5.8
1850 5.8
1851 5.8
1852 5.8
1853 5.8
1854 5.8
1855 5.8
1856 5.8
1857 5.8
1858 5.8
1859 5.8
1860 5.8
1861 5.8
1862 5.8
1863 5.8
1864 5.8
1865 5.8
1866 5.8
1867 5.8
1868 5.8
1869 5.8
1870 5.8
1871 5.8
1872 5.8
1873 5.8
1874 5.8
1875 5.8
1876 5.8
1877 5.8
1878 5.8
1879 5.8
1880 5.8
1881 5.8
1882 5.8
1883 5.8
1884 5.8
1885 5.8
1886 5.8
1887 5.8
1888 5.8
1889 5.8
1890 5.8
1891 5.8
1892 5.8
1893 5.8
1894 5.8
1895 5.8
1896 5.8
1897 5.8
1898 5.8
1899 5.8
1900 5.8
1901 5.8
1902 5.8
1903 5.8
1904 5.8
1905 5.8
1906 5.8
1907 5.8
1908 5.8
1909 5.8
1910 5.8
1911 5.8
1912 5.8
1913 5.8
1914 5.8
1915 5.8
1916 5.8
1917 5.8
1918 5.8
1919 5.8
1920 5.8
1921 5.8
1922 5.8
1923 5.8
1924 5.8
1925 5.8
1926 5.8
1927 5.8
1928 5.8
1929 5.8
1930 5.8
1931 5.8
1932 5.8
1933 5.8
1934 5.8
1935 5.8
1936 5.8
1937 5.8
1938 5.8
1939 5.8
1940 5.8
1941 5.8
1942 5.8
1943 5.8
1944 5.8
1945 5.8
1946 5.8
1947 5.8
1948 5.8
1949 5.8
1950 5.8
1951 5.77
1952 5.7
1953 5.62
1954 5.53
1955 5.44
1956 5.33
1957 5.22
1958 5.1
1959 4.97
1960 4.82
1961 4.66
1962 4.47
1963 4.27
1964 4.06
1965 3.84
1966 3.63
1967 3.42
1968 3.23
1969 3.05
1970 2.91
1971 2.79
1972 2.69
1973 2.61
1974 2.55
1975 2.51
1976 2.47
1977 2.45
1978 2.43
1979 2.41
1980 2.39
1981 2.38
1982 2.36
1983 2.35
1984 2.34
1985 2.32
1986 2.32
1987 2.31
1988 2.31
1989 2.3
1990 2.3
1991 2.29
1992 2.28
1993 2.26
1994 2.23
1995 2.2
1996 2.17
1997 2.15
1998 2.13
1999 2.11
2000 2.1
2001 2.1
2002 2.09
2003 2.07
2004 2.06
2005 2.04
2006 2.02
2007 1.99
2008 1.97
2009 1.95
2010 1.94
2011 1.92
2012 1.91
2013 1.89
2014 1.88
2015 1.87
2016 1.86
2017 1.85
2018 1.84