Year Total
1800 5.18
1801 5.18
1802 5.18
1803 5.18
1804 5.18
1805 5.18
1806 5.18
1807 5.18
1808 5.18
1809 5.18
1810 5.18
1811 5.18
1812 5.18
1813 5.18
1814 5.18
1815 5.18
1816 5.18
1817 5.18
1818 5.18
1819 5.18
1820 5.18
1821 5.18
1822 5.18
1823 5.18
1824 5.18
1825 5.18
1826 5.18
1827 5.18
1828 5.18
1829 5.18
1830 5.18
1831 5.18
1832 5.18
1833 5.18
1834 5.18
1835 5.18
1836 5.18
1837 5.18
1838 5.18
1839 5.18
1840 5.18
1841 5.18
1842 5.18
1843 5.18
1844 5.18
1845 5.18
1846 5.18
1847 5.18
1848 5.18
1849 5.18
1850 5.18
1851 5.15
1852 5.12
1853 5.09
1854 5.06
1855 5.03
1856 5
1857 4.97
1858 4.94
1859 4.91
1860 4.88
1861 4.85
1862 5.11
1863 5.41
1864 5.03
1865 5.11
1866 5.02
1867 4.64
1868 5.09
1869 5.12
1870 5.14
1871 5.23
1872 4.96
1873 5.18
1874 5.23
1875 5.55
1876 5.61
1877 5.29
1878 5.23
1879 5.58
1880 5.23
1881 5.28
1882 5.4
1883 5.5
1884 5.59
1885 5.48
1886 5.57
1887 5.41
1888 5.36
1889 5.35
1890 4.93
1891 5.2
1892 4.96
1893 5.25
1894 5.08
1895 5.11
1896 4.97
1897 4.95
1898 4.62
1899 4.79
1900 5.28
1901 5.22
1902 5.16
1903 5.1
1904 5.04
1905 4.98
1906 4.91
1907 4.85
1908 4.79
1909 4.73
1910 4.67
1911 4.59
1912 4.5
1913 4.42
1914 4.34
1915 4.26
1916 4.17
1917 4.09
1918 4.01
1919 3.93
1920 3.84
1921 3.81
1922 3.6
1923 3.39
1924 3.18
1925 3.36
1926 3.24
1927 3.05
1928 3.08
1929 2.92
1930 2.84
1931 2.84
1932 2.78
1933 2.72
1934 2.57
1935 2.55
1936 2.48
1937 2.42
1938 2.46
1939 2.5
1940 2.48
1941 2.51
1942 2.54
1943 2.57
1944 2.6
1945 2.63
1946 2.66
1947 2.69
1948 2.72
1949 2.75
1950 2.78
1951 2.76
1952 2.72
1953 2.67
1954 2.61
1955 2.53
1956 2.44
1957 2.34
1958 2.23
1959 2.12
1960 2.02
1961 1.94
1962 1.88
1963 1.84
1964 1.83
1965 1.85
1966 1.88
1967 1.92
1968 1.95
1969 1.98
1970 2.01
1971 2.03
1972 2.06
1973 2.1
1974 2.15
1975 2.18
1976 2.21
1977 2.2
1978 2.17
1979 2.12
1980 2.04
1981 1.96
1982 1.89
1983 1.84
1984 1.8
1985 1.79
1986 1.79
1987 1.81
1988 1.81
1989 1.82
1990 1.81
1991 1.78
1992 1.74
1993 1.69
1994 1.63
1995 1.56
1996 1.49
1997 1.43
1998 1.37
1999 1.33
2000 1.31
2001 1.29
2002 1.29
2003 1.29
2004 1.3
2005 1.3
2006 1.31
2007 1.32
2008 1.32
2009 1.33
2010 1.33
2011 1.33
2012 1.33
2013 1.34
2014 1.35
2015 1.36
2016 1.37
2017 1.39
2018 1.4