Year Total
1800 5.03
1801 5.03
1802 5.03
1803 5.03
1804 5.03
1805 5.03
1806 5.03
1807 5.03
1808 5.03
1809 5.03
1810 5.03
1811 5.03
1812 5.03
1813 5.03
1814 5.03
1815 5.03
1816 5.03
1817 5.03
1818 5.03
1819 5.03
1820 5.03
1821 5.03
1822 5.03
1823 5.03
1824 5.03
1825 5.03
1826 5.03
1827 5.03
1828 5.03
1829 5.03
1830 5.03
1831 5.03
1832 5.03
1833 5.03
1834 5.03
1835 5.03
1836 5.03
1837 5.03
1838 5.03
1839 5.03
1840 5.03
1841 5.03
1842 5.03
1843 5.03
1844 5.03
1845 5.03
1846 5.03
1847 5.03
1848 5.03
1849 5.03
1850 5.03
1851 5.03
1852 5.03
1853 5.03
1854 5.03
1855 5.03
1856 5.03
1857 5.03
1858 5.03
1859 5.03
1860 5.03
1861 5.03
1862 5.03
1863 5.03
1864 5.03
1865 5.03
1866 5.03
1867 5.03
1868 5.03
1869 5.03
1870 5.03
1871 5.03
1872 5.03
1873 5.03
1874 5.03
1875 5.03
1876 5.03
1877 5.03
1878 5.03
1879 5.03
1880 5.03
1881 5
1882 4.98
1883 4.95
1884 4.93
1885 4.9
1886 4.89
1887 4.87
1888 4.85
1889 4.83
1890 4.81
1891 4.84
1892 4.87
1893 4.9
1894 4.93
1895 4.96
1896 5
1897 5.04
1898 5.09
1899 5.13
1900 5.17
1901 5.13
1902 5.1
1903 5.06
1904 5.02
1905 4.98
1906 4.91
1907 4.83
1908 4.76
1909 4.68
1910 4.61
1911 5.25
1912 5.11
1913 4.96
1914 4.81
1915 4.66
1916 4.67
1917 4.68
1918 4.69
1919 4.7
1920 4.7
1921 4.9
1922 5.11
1923 5.31
1924 5.51
1925 5.71
1926 5.41
1927 5.12
1928 4.82
1929 4.53
1930 4.23
1931 4.27
1932 4.3
1933 4.33
1934 4.36
1935 4.4
1936 4.3
1937 4.2
1938 4.1
1939 4
1940 3.9
1941 4.15
1942 4.4
1943 4.65
1944 4.9
1945 5.15
1946 5.33
1947 5.51
1948 5.69
1949 5.87
1950 6.05
1951 5.99
1952 5.9
1953 5.84
1954 5.82
1955 5.83
1956 5.87
1957 5.94
1958 6.03
1959 6.11
1960 6.17
1961 6.18
1962 6.12
1963 5.99
1964 5.79
1965 5.51
1966 5.19
1967 4.85
1968 4.52
1969 4.21
1970 3.95
1971 3.74
1972 3.58
1973 3.44
1974 3.34
1975 3.26
1976 3.17
1977 3.07
1978 2.95
1979 2.82
1980 2.67
1981 2.53
1982 2.41
1983 2.33
1984 2.27
1985 2.25
1986 2.26
1987 2.27
1988 2.29
1989 2.3
1990 2.29
1991 2.28
1992 2.25
1993 2.22
1994 2.18
1995 2.14
1996 2.1
1997 2.07
1998 2.04
1999 2.01
2000 1.99
2001 1.96
2002 1.94
2003 1.9
2004 1.87
2005 1.82
2006 1.78
2007 1.72
2008 1.67
2009 1.62
2010 1.58
2011 1.54
2012 1.51
2013 1.48
2014 1.46
2015 1.44
2016 1.43
2017 1.43
2018 1.43