Year Total
1800 5.51
1801 5.51
1802 5.51
1803 5.51
1804 5.51
1805 5.51
1806 5.51
1807 5.51
1808 5.51
1809 5.51
1810 5.51
1811 5.51
1812 5.51
1813 5.51
1814 5.51
1815 5.51
1816 5.51
1817 5.51
1818 5.51
1819 5.51
1820 5.51
1821 5.51
1822 5.51
1823 5.51
1824 5.51
1825 5.51
1826 5.51
1827 5.51
1828 5.51
1829 5.51
1830 5.51
1831 5.51
1832 5.51
1833 5.51
1834 5.51
1835 5.51
1836 5.51
1837 5.51
1838 5.51
1839 5.51
1840 5.51
1841 5.51
1842 5.51
1843 5.51
1844 5.51
1845 5.51
1846 5.51
1847 5.51
1848 5.51
1849 5.51
1850 5.51
1851 5.51
1852 5.51
1853 5.51
1854 5.51
1855 5.51
1856 5.51
1857 5.51
1858 5.51
1859 5.51
1860 5.51
1861 5.51
1862 5.51
1863 5.51
1864 5.51
1865 5.51
1866 5.51
1867 5.51
1868 5.51
1869 5.51
1870 5.51
1871 5.51
1872 5.51
1873 5.51
1874 5.51
1875 5.51
1876 5.51
1877 5.51
1878 5.51
1879 5.51
1880 5.51
1881 5.51
1882 5.51
1883 5.51
1884 5.51
1885 5.51
1886 5.51
1887 5.51
1888 5.51
1889 5.51
1890 5.51
1891 5.51
1892 5.51
1893 5.51
1894 5.51
1895 5.51
1896 5.51
1897 5.51
1898 5.51
1899 5.51
1900 5.51
1901 5.51
1902 5.51
1903 5.51
1904 5.51
1905 5.51
1906 5.51
1907 5.51
1908 5.51
1909 5.51
1910 5.51
1911 5.51
1912 5.51
1913 5.51
1914 5.51
1915 5.51
1916 5.51
1917 5.51
1918 5.51
1919 5.51
1920 5.51
1921 5.51
1922 5.51
1923 5.51
1924 5.51
1925 5.51
1926 5.44
1927 5.37
1928 5.3
1929 5.23
1930 5.16
1931 5.09
1932 5.02
1933 4.95
1934 4.89
1935 4.82
1936 4.76
1937 4.69
1938 4.63
1939 4.56
1940 4.5
1941 4.44
1942 4.37
1943 4.31
1944 4.25
1945 4.19
1946 4.13
1947 4.07
1948 4.01
1949 3.95
1950 3.89
1951 4.04
1952 4.31
1953 4.52
1954 4.68
1955 4.79
1956 4.87
1957 4.9
1958 4.9
1959 4.86
1960 4.77
1961 4.65
1962 4.46
1963 4.22
1964 3.93
1965 3.62
1966 3.28
1967 2.96
1968 2.66
1969 2.39
1970 2.17
1971 1.98
1972 1.82
1973 1.68
1974 1.56
1975 1.48
1976 1.44
1977 1.45
1978 1.5
1979 1.59
1980 1.71
1981 1.84
1982 1.95
1983 2.05
1984 2.1
1985 2.12
1986 2.09
1987 2.03
1988 1.94
1989 1.84
1990 1.72
1991 1.61
1992 1.5
1993 1.4
1994 1.31
1995 1.24
1996 1.18
1997 1.12
1998 1.06
1999 1
2000 0.94
2001 0.89
2002 0.85
2003 0.83
2004 0.83
2005 0.84
2006 0.87
2007 0.91
2008 0.96
2009 1.01
2010 1.06
2011 1.11
2012 1.16
2013 1.21
2014 1.25
2015 1.28
2016 1.31
2017 1.34
2018 1.36