Year Total
1800 5.98
1801 5.98
1802 5.98
1803 5.98
1804 5.98
1805 5.98
1806 5.98
1807 5.98
1808 5.98
1809 5.98
1810 5.98
1811 5.98
1812 5.98
1813 5.98
1814 5.98
1815 5.98
1816 5.98
1817 5.98
1818 5.98
1819 5.98
1820 5.98
1821 5.98
1822 5.98
1823 5.98
1824 5.98
1825 5.98
1826 5.98
1827 5.98
1828 5.98
1829 5.98
1830 5.98
1831 5.98
1832 5.98
1833 5.98
1834 5.98
1835 5.98
1836 5.98
1837 5.98
1838 5.98
1839 5.98
1840 5.98
1841 6
1842 6.02
1843 6.05
1844 6.07
1845 6.09
1846 6.11
1847 6.13
1848 6.16
1849 6.18
1850 6.2
1851 6.22
1852 6.24
1853 5.99
1854 5.8
1855 5.99
1856 6.1
1857 6
1858 5.57
1859 5.57
1860 6.38
1861 5.31
1862 5.47
1863 5.47
1864 5.67
1865 4.82
1866 5.15
1867 5.29
1868 5.53
1869 5.64
1870 5.67
1871 5.56
1872 5.91
1873 6.02
1874 5.99
1875 5.71
1876 5.44
1877 5.21
1878 4.89
1879 5.44
1880 5.12
1881 6.19
1882 5.61
1883 5.72
1884 5.4
1885 3.46
1886 4.29
1887 4.42
1888 4.74
1889 5.19
1890 5.04
1891 4.6
1892 5.13
1893 5.05
1894 5.29
1895 4.85
1896 4.64
1897 4.66
1898 4.44
1899 4.49
1900 5.11
1901 5.72
1902 6.34
1903 6.3
1904 6.25
1905 6.21
1906 6.17
1907 6.12
1908 6.13
1909 6.14
1910 6.15
1911 6.16
1912 6.16
1913 6.08
1914 6
1915 5.92
1916 5.84
1917 5.76
1918 5.75
1919 5.73
1920 5.71
1921 5.7
1922 5.68
1923 5.67
1924 5.65
1925 5.64
1926 5.63
1927 5.61
1928 5.58
1929 5.54
1930 5.5
1931 5.47
1932 5.43
1933 5.33
1934 5.23
1935 5.13
1936 5.03
1937 4.93
1938 4.93
1939 4.94
1940 4.94
1941 4.95
1942 4.96
1943 4.95
1944 4.95
1945 4.94
1946 4.94
1947 4.94
1948 4.9
1949 4.86
1950 4.82
1951 4.9
1952 5.02
1953 5.11
1954 5.18
1955 5.23
1956 5.25
1957 5.24
1958 5.22
1959 5.17
1960 5.1
1961 5.05
1962 5
1963 4.93
1964 4.84
1965 4.75
1966 4.63
1967 4.5
1968 4.35
1969 4.19
1970 4.02
1971 3.84
1972 3.67
1973 3.51
1974 3.35
1975 3.22
1976 3.1
1977 2.99
1978 2.91
1979 2.83
1980 2.78
1981 2.74
1982 2.71
1983 2.69
1984 2.68
1985 2.67
1986 2.65
1987 2.64
1988 2.61
1989 2.58
1990 2.55
1991 2.5
1992 2.46
1993 2.41
1994 2.36
1995 2.31
1996 2.27
1997 2.23
1998 2.18
1999 2.14
2000 2.11
2001 2.07
2002 2.05
2003 2.02
2004 2
2005 1.98
2006 1.96
2007 1.95
2008 1.93
2009 1.9
2010 1.88
2011 1.86
2012 1.83
2013 1.82
2014 1.8
2015 1.79
2016 1.77
2017 1.77
2018 1.76