Year Total
1800 6
1801 5.99
1802 5.97
1803 5.96
1804 5.95
1805 5.94
1806 5.92
1807 5.91
1808 5.9
1809 5.88
1810 5.87
1811 5.86
1812 5.84
1813 5.83
1814 5.82
1815 5.81
1816 5.79
1817 5.78
1818 5.77
1819 5.75
1820 5.74
1821 5.73
1822 5.72
1823 5.7
1824 5.69
1825 5.68
1826 5.66
1827 5.65
1828 5.64
1829 5.62
1830 5.61
1831 5.6
1832 5.59
1833 5.57
1834 5.56
1835 5.55
1836 5.53
1837 5.52
1838 5.51
1839 5.5
1840 5.48
1841 5.47
1842 5.46
1843 5.44
1844 5.43
1845 5.42
1846 5.4
1847 5.39
1848 5.38
1849 5.37
1850 5.35
1851 5.34
1852 5.33
1853 5.31
1854 5.3
1855 5.29
1856 5.28
1857 5.26
1858 5.25
1859 5.24
1860 5.22
1861 5.21
1862 5.2
1863 5.18
1864 5.17
1865 5.16
1866 5.15
1867 5.13
1868 5.12
1869 5.11
1870 5.09
1871 5.08
1872 5.07
1873 5.05
1874 5.04
1875 5.03
1876 5.02
1877 5
1878 4.99
1879 4.98
1880 4.96
1881 4.95
1882 4.94
1883 4.93
1884 4.91
1885 4.9
1886 4.89
1887 4.87
1888 4.86
1889 4.85
1890 4.83
1891 4.82
1892 4.81
1893 4.8
1894 4.78
1895 4.77
1896 4.76
1897 4.74
1898 4.73
1899 4.72
1900 4.71
1901 4.69
1902 4.68
1903 4.67
1904 4.65
1905 4.64
1906 4.63
1907 4.61
1908 4.6
1909 4.59
1910 4.58
1911 4.56
1912 4.55
1913 4.54
1914 4.52
1915 4.51
1916 4.5
1917 4.49
1918 4.47
1919 4.46
1920 4.45
1921 4.43
1922 4.42
1923 4.41
1924 4.39
1925 4.38
1926 4.39
1927 4.4
1928 4.41
1929 4.41
1930 4.42
1931 4.36
1932 4.3
1933 4.25
1934 4.19
1935 4.13
1936 3.93
1937 3.74
1938 3.54
1939 3.34
1940 3.15
1941 3.32
1942 3.49
1943 3.66
1944 3.84
1945 4.01
1946 4.11
1947 4.21
1948 4.32
1949 4.42
1950 4.52
1951 4.45
1952 4.32
1953 4.21
1954 4.11
1955 4.03
1956 3.96
1957 3.92
1958 3.88
1959 3.86
1960 3.84
1961 3.84
1962 3.83
1963 3.82
1964 3.82
1965 3.81
1966 3.8
1967 3.8
1968 3.81
1969 3.81
1970 3.82
1971 3.81
1972 3.8
1973 3.77
1974 3.72
1975 3.66
1976 3.59
1977 3.51
1978 3.43
1979 3.35
1980 3.28
1981 3.22
1982 3.17
1983 3.13
1984 3.11
1985 3.09
1986 3.07
1987 3.06
1988 3.04
1989 3.02
1990 3
1991 2.97
1992 2.95
1993 2.94
1994 2.93
1995 2.92
1996 2.92
1997 2.92
1998 2.92
1999 2.92
2000 2.92
2001 2.92
2002 2.91
2003 2.91
2004 2.91
2005 2.91
2006 2.92
2007 2.93
2008 2.95
2009 2.97
2010 3
2011 3.01
2012 3.03
2013 3.03
2014 3.02
2015 3
2016 2.97
2017 2.95
2018 2.92