Year Total
1800 5.36
1801 5.36
1802 5.36
1803 5.36
1804 5.36
1805 5.36
1806 5.36
1807 5.36
1808 5.36
1809 5.36
1810 5.36
1811 5.36
1812 5.36
1813 5.36
1814 5.36
1815 5.36
1816 5.36
1817 5.36
1818 5.36
1819 5.36
1820 5.36
1821 5.36
1822 5.36
1823 5.36
1824 5.36
1825 5.36
1826 5.36
1827 5.36
1828 5.36
1829 5.36
1830 5.36
1831 5.36
1832 5.36
1833 5.36
1834 5.36
1835 5.36
1836 5.36
1837 5.36
1838 5.36
1839 5.36
1840 5.36
1841 5.36
1842 5.36
1843 5.36
1844 5.36
1845 5.36
1846 5.36
1847 5.36
1848 5.36
1849 5.36
1850 5.36
1851 5.36
1852 5.36
1853 5.36
1854 5.36
1855 5.36
1856 5.36
1857 5.36
1858 5.36
1859 5.36
1860 5.36
1861 5.36
1862 5.36
1863 5.36
1864 5.36
1865 5.36
1866 5.36
1867 5.36
1868 5.36
1869 5.36
1870 5.36
1871 5.36
1872 5.36
1873 5.36
1874 5.36
1875 5.36
1876 5.36
1877 5.36
1878 5.36
1879 5.36
1880 5.36
1881 5.36
1882 5.36
1883 5.36
1884 5.36
1885 5.36
1886 5.36
1887 5.36
1888 5.36
1889 5.36
1890 5.36
1891 5.36
1892 5.36
1893 5.36
1894 5.36
1895 5.36
1896 5.36
1897 5.36
1898 5.36
1899 5.36
1900 5.36
1901 5.38
1902 5.4
1903 5.4
1904 5.39
1905 5.39
1906 5.39
1907 5.39
1908 5.44
1909 5.48
1910 5.53
1911 5.58
1912 5.63
1913 5.5
1914 5.38
1915 5.25
1916 5.12
1917 5
1918 5.07
1919 5.14
1920 5.22
1921 5.29
1922 5.36
1923 5.33
1924 5.31
1925 5.28
1926 5.25
1927 5.23
1928 5.18
1929 5.14
1930 5.1
1931 5.05
1932 5.01
1933 5.02
1934 5.03
1935 5.04
1936 5.05
1937 5.07
1938 5.11
1939 5.16
1940 5.2
1941 5.25
1942 5.29
1943 5.31
1944 5.32
1945 5.33
1946 5.35
1947 5.36
1948 5.47
1949 5.57
1950 5.68
1951 5.7
1952 5.75
1953 5.79
1954 5.82
1955 5.85
1956 5.87
1957 5.88
1958 5.89
1959 5.88
1960 5.87
1961 5.85
1962 5.81
1963 5.77
1964 5.71
1965 5.64
1966 5.56
1967 5.47
1968 5.38
1969 5.28
1970 5.17
1971 5.06
1972 4.94
1973 4.81
1974 4.68
1975 4.54
1976 4.4
1977 4.26
1978 4.13
1979 4
1980 3.88
1981 3.78
1982 3.68
1983 3.58
1984 3.49
1985 3.41
1986 3.34
1987 3.26
1988 3.19
1989 3.12
1990 3.06
1991 3
1992 2.95
1993 2.91
1994 2.88
1995 2.85
1996 2.83
1997 2.81
1998 2.79
1999 2.77
2000 2.74
2001 2.72
2002 2.7
2003 2.68
2004 2.66
2005 2.65
2006 2.64
2007 2.64
2008 2.63
2009 2.63
2010 2.62
2011 2.61
2012 2.6
2013 2.59
2014 2.57
2015 2.54
2016 2.51
2017 2.49
2018 2.46