Year Total
1800 5.76
1801 5.76
1802 5.75
1803 5.74
1804 5.74
1805 5.73
1806 5.72
1807 5.72
1808 5.71
1809 5.7
1810 5.7
1811 5.69
1812 5.68
1813 5.67
1814 5.67
1815 5.66
1816 5.65
1817 5.65
1818 5.64
1819 5.63
1820 5.63
1821 5.62
1822 5.61
1823 5.61
1824 5.6
1825 5.59
1826 5.59
1827 5.58
1828 5.57
1829 5.57
1830 5.56
1831 5.55
1832 5.55
1833 5.54
1834 5.53
1835 5.53
1836 5.52
1837 5.51
1838 5.51
1839 5.5
1840 5.49
1841 5.49
1842 5.48
1843 5.47
1844 5.47
1845 5.46
1846 5.45
1847 5.45
1848 5.44
1849 5.43
1850 5.43
1851 5.42
1852 5.41
1853 5.41
1854 5.4
1855 5.39
1856 5.39
1857 5.38
1858 5.37
1859 5.37
1860 5.36
1861 5.35
1862 5.35
1863 5.34
1864 5.33
1865 5.33
1866 5.32
1867 5.31
1868 5.31
1869 5.3
1870 5.29
1871 5.29
1872 5.28
1873 5.27
1874 5.27
1875 5.26
1876 5.25
1877 5.25
1878 5.24
1879 5.23
1880 5.23
1881 5.22
1882 5.21
1883 5.21
1884 5.2
1885 5.19
1886 5.19
1887 5.18
1888 5.17
1889 5.17
1890 5.16
1891 5.15
1892 5.15
1893 5.14
1894 5.13
1895 5.13
1896 5.12
1897 5.11
1898 5.06
1899 5.01
1900 4.96
1901 4.91
1902 4.86
1903 4.81
1904 4.76
1905 4.7
1906 4.65
1907 4.6
1908 4.55
1909 4.5
1910 4.45
1911 4.4
1912 4.35
1913 4.3
1914 4.25
1915 4.19
1916 4.14
1917 4.09
1918 4.04
1919 3.99
1920 3.94
1921 3.89
1922 3.84
1923 3.79
1924 3.73
1925 3.68
1926 3.63
1927 3.64
1928 3.65
1929 3.66
1930 3.67
1931 3.56
1932 3.46
1933 3.35
1934 3.25
1935 3.14
1936 3.13
1937 3.13
1938 3.12
1939 3.12
1940 3.11
1941 3.07
1942 3.04
1943 3.01
1944 2.97
1945 2.94
1946 2.91
1947 2.87
1948 2.84
1949 2.81
1950 2.78
1951 2.79
1952 2.79
1953 2.78
1954 2.77
1955 2.75
1956 2.71
1957 2.68
1958 2.63
1959 2.59
1960 2.54
1961 2.49
1962 2.45
1963 2.41
1964 2.38
1965 2.35
1966 2.33
1967 2.32
1968 2.31
1969 2.31
1970 2.31
1971 2.3
1972 2.29
1973 2.27
1974 2.24
1975 2.21
1976 2.17
1977 2.13
1978 2.1
1979 2.07
1980 2.06
1981 2.05
1982 2.05
1983 2.05
1984 2.06
1985 2.06
1986 2.06
1987 2.05
1988 2.03
1989 2
1990 1.96
1991 1.91
1992 1.85
1993 1.78
1994 1.71
1995 1.64
1996 1.57
1997 1.5
1998 1.44
1999 1.38
2000 1.34
2001 1.31
2002 1.29
2003 1.29
2004 1.3
2005 1.32
2006 1.35
2007 1.39
2008 1.43
2009 1.47
2010 1.51
2011 1.54
2012 1.57
2013 1.6
2014 1.62
2015 1.64
2016 1.65
2017 1.66
2018 1.67