Year Total
1800 7.5
1801 7.5
1802 7.5
1803 7.5
1804 7.5
1805 7.5
1806 7.5
1807 7.5
1808 7.5
1809 7.5
1810 7.5
1811 7.5
1812 7.5
1813 7.5
1814 7.5
1815 7.5
1816 7.5
1817 7.5
1818 7.5
1819 7.5
1820 7.5
1821 7.5
1822 7.5
1823 7.5
1824 7.5
1825 7.5
1826 7.5
1827 7.5
1828 7.5
1829 7.5
1830 7.5
1831 7.5
1832 7.5
1833 7.5
1834 7.5
1835 7.5
1836 7.5
1837 7.5
1838 7.5
1839 7.5
1840 7.5
1841 7.5
1842 7.5
1843 7.5
1844 7.5
1845 7.5
1846 7.5
1847 7.5
1848 7.5
1849 7.5
1850 7.5
1851 7.5
1852 7.5
1853 7.5
1854 7.5
1855 7.5
1856 7.5
1857 7.5
1858 7.5
1859 7.5
1860 7.5
1861 7.5
1862 7.5
1863 7.5
1864 7.5
1865 7.5
1866 7.5
1867 7.5
1868 7.5
1869 7.5
1870 7.5
1871 7.5
1872 7.5
1873 7.5
1874 7.5
1875 7.5
1876 7.5
1877 7.5
1878 7.5
1879 7.5
1880 7.5
1881 7.46
1882 7.43
1883 7.39
1884 7.36
1885 7.32
1886 7.29
1887 7.25
1888 7.21
1889 7.18
1890 7.14
1891 7.11
1892 7.07
1893 7.03
1894 7
1895 6.96
1896 6.93
1897 6.89
1898 6.83
1899 6.76
1900 6.69
1901 6.63
1902 6.56
1903 6.5
1904 6.43
1905 6.36
1906 6.3
1907 6.23
1908 6.17
1909 6.1
1910 6.03
1911 5.97
1912 5.9
1913 5.83
1914 5.77
1915 5.7
1916 5.64
1917 5.57
1918 5.5
1919 5.44
1920 5.37
1921 5.31
1922 5.24
1923 5.17
1924 5.11
1925 5.04
1926 4.98
1927 4.84
1928 4.71
1929 4.58
1930 4.45
1931 4.31
1932 4.18
1933 4.05
1934 3.92
1935 3.78
1936 3.65
1937 3.52
1938 3.39
1939 3.25
1940 3.12
1941 3.08
1942 3.04
1943 3
1944 2.96
1945 2.92
1946 2.88
1947 2.84
1948 2.8
1949 2.76
1950 2.72
1951 2.75
1952 2.81
1953 2.85
1954 2.85
1955 2.83
1956 2.79
1957 2.72
1958 2.63
1959 2.53
1960 2.42
1961 2.31
1962 2.21
1963 2.13
1964 2.07
1965 2.03
1966 2.02
1967 2.01
1968 2.02
1969 2.03
1970 2.05
1971 2.06
1972 2.06
1973 2.06
1974 2.05
1975 2.03
1976 2.02
1977 2
1978 1.99
1979 1.99
1980 1.99
1981 2
1982 2
1983 2.01
1984 2.01
1985 2
1986 1.99
1987 1.96
1988 1.92
1989 1.87
1990 1.81
1991 1.74
1992 1.66
1993 1.58
1994 1.49
1995 1.41
1996 1.34
1997 1.27
1998 1.22
1999 1.17
2000 1.15
2001 1.14
2002 1.15
2003 1.17
2004 1.2
2005 1.25
2006 1.3
2007 1.34
2008 1.38
2009 1.42
2010 1.45
2011 1.47
2012 1.49
2013 1.5
2014 1.51
2015 1.53
2016 1.54
2017 1.55
2018 1.56