Year Total
1800 5.47
1801 5.47
1802 5.46
1803 5.46
1804 5.46
1805 5.45
1806 5.45
1807 5.44
1808 5.44
1809 5.44
1810 5.43
1811 5.43
1812 5.43
1813 5.42
1814 5.42
1815 5.42
1816 5.41
1817 5.41
1818 5.4
1819 5.4
1820 5.4
1821 5.39
1822 5.39
1823 5.39
1824 5.38
1825 5.38
1826 5.37
1827 5.37
1828 5.37
1829 5.36
1830 5.36
1831 5.36
1832 5.35
1833 5.35
1834 5.35
1835 5.34
1836 5.34
1837 5.33
1838 5.33
1839 5.33
1840 5.32
1841 5.32
1842 5.32
1843 5.31
1844 5.31
1845 5.31
1846 5.3
1847 5.3
1848 5.29
1849 5.29
1850 5.29
1851 5.28
1852 5.28
1853 5.28
1854 5.27
1855 5.27
1856 5.26
1857 5.26
1858 5.26
1859 5.25
1860 5.25
1861 5.25
1862 5.24
1863 5.24
1864 5.24
1865 5.23
1866 5.23
1867 5.22
1868 5.22
1869 5.22
1870 5.21
1871 5.21
1872 5.21
1873 5.2
1874 5.2
1875 5.2
1876 5.19
1877 5.19
1878 5.18
1879 5.18
1880 5.18
1881 5.17
1882 5.17
1883 5.17
1884 5.28
1885 5.39
1886 5.51
1887 5.62
1888 5.73
1889 5.71
1890 5.69
1891 5.68
1892 5.66
1893 5.64
1894 5.62
1895 5.6
1896 5.58
1897 5.57
1898 5.55
1899 5.53
1900 5.51
1901 5.49
1902 5.47
1903 5.46
1904 5.44
1905 5.42
1906 5.41
1907 5.39
1908 5.38
1909 5.38
1910 5.39
1911 5.39
1912 5.39
1913 5.4
1914 5.44
1915 5.49
1916 5.53
1917 5.58
1918 5.62
1919 5.68
1920 5.73
1921 5.78
1922 5.83
1923 5.89
1924 6
1925 6.12
1926 6.23
1927 6.35
1928 6.46
1929 6.61
1930 6.76
1931 6.9
1932 7.05
1933 7.19
1934 7.29
1935 7.39
1936 7.48
1937 7.58
1938 7.68
1939 7.29
1940 6.9
1941 6.51
1942 6.12
1943 5.72
1944 5.9
1945 6.08
1946 6.25
1947 6.43
1948 6.6
1949 6.55
1950 6.49
1951 6.54
1952 6.62
1953 6.66
1954 6.66
1955 6.62
1956 6.54
1957 6.42
1958 6.25
1959 6.06
1960 5.82
1961 5.56
1962 5.27
1963 4.97
1964 4.66
1965 4.36
1966 4.07
1967 3.82
1968 3.58
1969 3.38
1970 3.19
1971 3.01
1972 2.84
1973 2.65
1974 2.46
1975 2.27
1976 2.1
1977 1.95
1978 1.83
1979 1.74
1980 1.82
1981 1.78
1982 1.74
1983 1.61
1984 1.62
1985 1.61
1986 1.43
1987 1.62
1988 1.96
1989 1.75
1990 1.83
1991 1.73
1992 1.72
1993 1.74
1994 1.71
1995 1.67
1996 1.66
1997 1.61
1998 1.48
1999 1.47
2000 1.6
2001 1.41
2002 1.37
2003 1.27
2004 1.26
2005 1.26
2006 1.28
2007 1.29
2008 1.28
2009 1.26
2010 1.26
2011 1.26
2012 1.26
2013 1.25
2014 1.25
2015 1.24
2016 1.25
2017 1.25
2018 1.26