Year Total
1800 5.49
1801 5.49
1802 5.49
1803 5.49
1804 5.49
1805 5.49
1806 5.49
1807 5.49
1808 5.49
1809 5.49
1810 5.49
1811 5.49
1812 5.49
1813 5.49
1814 5.49
1815 5.49
1816 5.49
1817 5.49
1818 5.49
1819 5.49
1820 5.49
1821 5.49
1822 5.49
1823 5.49
1824 5.49
1825 5.49
1826 5.49
1827 5.49
1828 5.49
1829 5.49
1830 5.49
1831 5.49
1832 5.49
1833 5.49
1834 5.49
1835 5.49
1836 5.49
1837 5.49
1838 5.49
1839 5.49
1840 5.49
1841 5.49
1842 5.49
1843 5.49
1844 5.49
1845 5.49
1846 5.49
1847 5.49
1848 5.49
1849 5.49
1850 5.49
1851 5.49
1852 5.49
1853 5.49
1854 5.49
1855 5.49
1856 5.49
1857 5.49
1858 5.49
1859 5.49
1860 5.49
1861 5.49
1862 5.49
1863 5.49
1864 5.49
1865 5.49
1866 5.49
1867 5.49
1868 5.49
1869 5.49
1870 5.49
1871 5.49
1872 5.49
1873 5.49
1874 5.49
1875 5.49
1876 5.49
1877 5.49
1878 5.49
1879 5.49
1880 5.49
1881 5.48
1882 5.46
1883 5.45
1884 5.44
1885 5.42
1886 5.41
1887 5.4
1888 5.38
1889 5.37
1890 5.36
1891 5.34
1892 5.33
1893 5.32
1894 5.31
1895 5.29
1896 5.28
1897 5.27
1898 5.25
1899 5.24
1900 5.23
1901 5.28
1902 5.33
1903 5.39
1904 5.44
1905 5.49
1906 5.36
1907 5.23
1908 5.1
1909 4.97
1910 4.84
1911 4.69
1912 4.54
1913 4.39
1914 4.24
1915 4.09
1916 4.19
1917 4.3
1918 4.41
1919 4.52
1920 4.62
1921 4.59
1922 4.56
1923 4.53
1924 4.49
1925 4.46
1926 4.49
1927 4.51
1928 4.53
1929 4.56
1930 4.58
1931 4.58
1932 4.57
1933 4.57
1934 4.56
1935 4.56
1936 4.52
1937 4.48
1938 4.44
1939 4.4
1940 4.36
1941 4.51
1942 4.67
1943 4.83
1944 4.99
1945 5.15
1946 5.13
1947 5.12
1948 4.84
1949 4.57
1950 4.21
1951 4.2
1952 4.16
1953 4.12
1954 4.07
1955 4.01
1956 3.94
1957 3.86
1958 3.77
1959 3.66
1960 3.53
1961 3.38
1962 3.2
1963 3.01
1964 2.8
1965 2.59
1966 2.4
1967 2.24
1968 2.11
1969 2.02
1970 1.98
1971 1.96
1972 1.98
1973 2
1974 2.04
1975 2.06
1976 2.08
1977 2.09
1978 2.08
1979 2.06
1980 2.03
1981 2
1982 1.98
1983 1.97
1984 1.97
1985 1.98
1986 1.99
1987 2.01
1988 2.02
1989 2.03
1990 2.03
1991 2.02
1992 2.01
1993 2
1994 1.99
1995 1.97
1996 1.93
1997 1.89
1998 1.83
1999 1.75
2000 1.67
2001 1.6
2002 1.53
2003 1.47
2004 1.42
2005 1.4
2006 1.38
2007 1.38
2008 1.38
2009 1.38
2010 1.39
2011 1.4
2012 1.41
2013 1.42
2014 1.43
2015 1.44
2016 1.46
2017 1.47
2018 1.48