Year Total
1800 5.47
1801 5.47
1802 5.47
1803 5.47
1804 5.47
1805 5.47
1806 5.47
1807 5.47
1808 5.47
1809 5.47
1810 5.47
1811 5.47
1812 5.47
1813 5.47
1814 5.47
1815 5.47
1816 5.47
1817 5.47
1818 5.47
1819 5.47
1820 5.47
1821 5.47
1822 5.47
1823 5.47
1824 5.47
1825 5.47
1826 5.47
1827 5.47
1828 5.47
1829 5.47
1830 5.47
1831 5.47
1832 5.47
1833 5.47
1834 5.47
1835 5.47
1836 5.47
1837 5.47
1838 5.47
1839 5.47
1840 5.47
1841 5.47
1842 5.47
1843 5.47
1844 5.47
1845 5.47
1846 5.47
1847 5.47
1848 5.47
1849 5.47
1850 5.47
1851 5.42
1852 5.38
1853 5.33
1854 5.29
1855 5.24
1856 5.19
1857 5.15
1858 5.1
1859 5.06
1860 5.01
1861 4.96
1862 4.93
1863 4.9
1864 4.9
1865 4.91
1866 4.91
1867 4.92
1868 4.92
1869 4.91
1870 4.9
1871 4.9
1872 4.89
1873 4.88
1874 4.89
1875 4.9
1876 4.9
1877 4.91
1878 4.92
1879 4.95
1880 4.98
1881 5
1882 5.03
1883 5.06
1884 5.05
1885 5.04
1886 5.04
1887 5.03
1888 5.02
1889 4.98
1890 4.95
1891 4.91
1892 4.88
1893 4.84
1894 4.79
1895 4.74
1896 4.69
1897 4.64
1898 4.59
1899 4.56
1900 4.53
1901 4.49
1902 4.46
1903 4.43
1904 4.44
1905 4.45
1906 4.45
1907 4.46
1908 4.47
1909 4.43
1910 4.39
1911 4.36
1912 4.32
1913 4.28
1914 4.04
1915 3.8
1916 3.56
1917 3.32
1918 3.08
1919 3.24
1920 3.41
1921 3.57
1922 3.74
1923 3.9
1924 3.81
1925 3.72
1926 3.64
1927 3.55
1928 3.46
1929 3.42
1930 3.38
1931 3.21
1932 3.06
1933 3.04
1934 3
1935 2.98
1936 2.87
1937 2.93
1938 3.05
1939 3.07
1940 3.07
1941 2.74
1942 2.69
1943 2.61
1944 2.39
1945 2.37
1946 3.01
1947 2.9
1948 2.84
1949 2.63
1950 2.45
1951 2.42
1952 2.37
1953 2.32
1954 2.29
1955 2.28
1956 2.28
1957 2.29
1958 2.32
1959 2.35
1960 2.39
1961 2.43
1962 2.47
1963 2.5
1964 2.52
1965 2.53
1966 2.53
1967 2.52
1968 2.5
1969 2.48
1970 2.44
1971 2.4
1972 2.35
1973 2.28
1974 2.2
1975 2.12
1976 2.03
1977 1.94
1978 1.85
1979 1.76
1980 1.69
1981 1.62
1982 1.55
1983 1.5
1984 1.45
1985 1.42
1986 1.38
1987 1.36
1988 1.34
1989 1.32
1990 1.3
1991 1.29
1992 1.27
1993 1.26
1994 1.25
1995 1.24
1996 1.23
1997 1.23
1998 1.23
1999 1.24
2000 1.25
2001 1.27
2002 1.29
2003 1.31
2004 1.34
2005 1.36
2006 1.38
2007 1.4
2008 1.41
2009 1.42
2010 1.43
2011 1.43
2012 1.43
2013 1.44
2014 1.45
2015 1.46
2016 1.47
2017 1.48
2018 1.5