Year Total
1800 5.55
1801 5.55
1802 5.55
1803 5.55
1804 5.55
1805 5.55
1806 5.56
1807 5.56
1808 5.56
1809 5.56
1810 5.56
1811 5.56
1812 5.56
1813 5.56
1814 5.56
1815 5.56
1816 5.56
1817 5.56
1818 5.57
1819 5.57
1820 5.57
1821 5.57
1822 5.57
1823 5.57
1824 5.57
1825 5.57
1826 5.57
1827 5.57
1828 5.57
1829 5.58
1830 5.58
1831 5.58
1832 5.58
1833 5.58
1834 5.58
1835 5.58
1836 5.58
1837 5.58
1838 5.58
1839 5.58
1840 5.59
1841 5.59
1842 5.59
1843 5.59
1844 5.59
1845 5.59
1846 5.59
1847 5.59
1848 5.59
1849 5.59
1850 5.59
1851 5.59
1852 5.6
1853 5.6
1854 5.6
1855 5.6
1856 5.6
1857 5.6
1858 5.6
1859 5.6
1860 5.6
1861 5.6
1862 5.6
1863 5.61
1864 5.61
1865 5.61
1866 5.61
1867 5.61
1868 5.61
1869 5.61
1870 5.61
1871 5.61
1872 5.61
1873 5.61
1874 5.62
1875 5.62
1876 5.62
1877 5.62
1878 5.62
1879 5.62
1880 5.62
1881 5.62
1882 5.62
1883 5.62
1884 5.62
1885 5.62
1886 5.63
1887 5.63
1888 5.63
1889 5.63
1890 5.63
1891 5.63
1892 5.63
1893 5.63
1894 5.63
1895 5.63
1896 5.63
1897 5.64
1898 5.64
1899 5.64
1900 5.64
1901 5.64
1902 5.64
1903 5.64
1904 5.64
1905 5.64
1906 5.64
1907 5.64
1908 5.65
1909 5.65
1910 5.65
1911 5.65
1912 5.65
1913 5.65
1914 5.65
1915 5.65
1916 5.65
1917 5.65
1918 5.65
1919 5.65
1920 5.66
1921 5.66
1922 5.66
1923 5.66
1924 5.66
1925 5.66
1926 5.66
1927 5.67
1928 5.67
1929 5.67
1930 5.68
1931 5.68
1932 5.69
1933 5.69
1934 5.69
1935 5.7
1936 5.7
1937 5.7
1938 5.71
1939 5.71
1940 5.71
1941 5.72
1942 5.72
1943 5.73
1944 5.73
1945 5.73
1946 5.74
1947 5.74
1948 5.74
1949 5.75
1950 5.75
1951 5.78
1952 5.83
1953 5.88
1954 5.94
1955 5.99
1956 6.05
1957 6.11
1958 6.17
1959 6.23
1960 6.28
1961 6.34
1962 6.39
1963 6.45
1964 6.5
1965 6.54
1966 6.59
1967 6.63
1968 6.67
1969 6.71
1970 6.75
1971 6.79
1972 6.82
1973 6.86
1974 6.9
1975 6.93
1976 6.96
1977 6.98
1978 7
1979 7.02
1980 7.03
1981 7.03
1982 7.02
1983 7.01
1984 6.99
1985 6.97
1986 6.94
1987 6.9
1988 6.86
1989 6.81
1990 6.74
1991 6.68
1992 6.6
1993 6.53
1994 6.45
1995 6.36
1996 6.28
1997 6.2
1998 6.12
1999 6.04
2000 5.96
2001 5.89
2002 5.82
2003 5.75
2004 5.69
2005 5.63
2006 5.58
2007 5.52
2008 5.47
2009 5.42
2010 5.36
2011 5.31
2012 5.25
2013 5.18
2014 5.12
2015 5.05
2016 4.98
2017 4.91
2018 4.84