Year Total
1800 4.88
1801 4.88
1802 4.88
1803 4.88
1804 4.88
1805 4.88
1806 4.88
1807 4.88
1808 4.88
1809 4.88
1810 4.88
1811 4.88
1812 4.88
1813 4.88
1814 4.88
1815 4.88
1816 4.88
1817 4.88
1818 4.88
1819 4.88
1820 4.88
1821 4.88
1822 4.88
1823 4.88
1824 4.88
1825 4.88
1826 4.88
1827 4.88
1828 4.88
1829 4.88
1830 4.88
1831 4.88
1832 4.88
1833 4.88
1834 4.88
1835 4.88
1836 4.88
1837 4.88
1838 4.88
1839 4.88
1840 4.88
1841 4.88
1842 4.88
1843 4.88
1844 4.88
1845 4.88
1846 4.88
1847 4.88
1848 4.88
1849 4.88
1850 4.88
1851 4.87
1852 4.86
1853 4.85
1854 4.85
1855 4.84
1856 4.83
1857 4.82
1858 4.82
1859 4.81
1860 4.8
1861 4.74
1862 4.68
1863 4.62
1864 4.56
1865 4.5
1866 4.44
1867 4.38
1868 4.32
1869 4.26
1870 4.2
1871 4.16
1872 4.13
1873 4.09
1874 4.05
1875 4.01
1876 3.97
1877 3.93
1878 3.89
1879 3.85
1880 3.81
1881 3.81
1882 3.82
1883 3.82
1884 3.83
1885 3.83
1886 3.84
1887 3.84
1888 3.85
1889 3.85
1890 3.86
1891 3.88
1892 3.9
1893 3.92
1894 3.94
1895 3.97
1896 3.99
1897 4.01
1898 4.03
1899 4.06
1900 4.08
1901 4.1
1902 4.09
1903 4.07
1904 4.06
1905 4.04
1906 4.03
1907 4.01
1908 4
1909 3.85
1910 3.69
1911 3.8
1912 3.9
1913 4
1914 3.98
1915 3.96
1916 3.94
1917 3.92
1918 3.9
1919 3.89
1920 3.87
1921 3.86
1922 3.67
1923 3.72
1924 3.6
1925 3.54
1926 3.66
1927 3.55
1928 3.32
1929 3.38
1930 3.49
1931 3.49
1932 3.33
1933 3.09
1934 3.14
1935 3.05
1936 3.03
1937 2.8
1938 2.76
1939 2.68
1940 2.79
1941 2.91
1942 3.24
1943 3.33
1944 3.36
1945 3.53
1946 3.46
1947 3.63
1948 3.75
1949 3.76
1950 3.62
1951 3.69
1952 3.82
1953 3.93
1954 4.02
1955 4.1
1956 4.15
1957 4.18
1958 4.19
1959 4.17
1960 4.13
1961 4.07
1962 3.98
1963 3.86
1964 3.74
1965 3.6
1966 3.46
1967 3.34
1968 3.22
1969 3.12
1970 3.03
1971 2.95
1972 2.88
1973 2.8
1974 2.73
1975 2.65
1976 2.57
1977 2.49
1978 2.42
1979 2.36
1980 2.31
1981 2.27
1982 2.23
1983 2.2
1984 2.17
1985 2.15
1986 2.14
1987 2.13
1988 2.14
1989 2.15
1990 2.16
1991 2.17
1992 2.17
1993 2.17
1994 2.15
1995 2.13
1996 2.1
1997 2.07
1998 2.05
1999 2.02
2000 2.01
2001 2
2002 2.01
2003 2.02
2004 2.04
2005 2.07
2006 2.09
2007 2.1
2008 2.1
2009 2.09
2010 2.07
2011 2.04
2012 2.01
2013 1.99
2014 1.96
2015 1.95
2016 1.93
2017 1.92
2018 1.91