Year Total
1800 5.33
1801 5.32
1802 5.31
1803 5.3
1804 5.3
1805 5.29
1806 5.28
1807 5.28
1808 5.27
1809 5.26
1810 5.25
1811 5.25
1812 5.24
1813 5.23
1814 5.22
1815 5.22
1816 5.21
1817 5.2
1818 5.19
1819 5.19
1820 5.18
1821 5.17
1822 5.16
1823 5.16
1824 5.15
1825 5.14
1826 5.14
1827 5.14
1828 5.14
1829 5.14
1830 5.14
1831 5.14
1832 5.14
1833 5.14
1834 5.14
1835 5.14
1836 5.14
1837 5.14
1838 5.14
1839 5.14
1840 5.14
1841 5.15
1842 5.15
1843 5.15
1844 5.15
1845 5.15
1846 5.15
1847 5.15
1848 5.15
1849 5.15
1850 5.15
1851 5.14
1852 5.13
1853 5.12
1854 5.11
1855 5.11
1856 5.1
1857 5.09
1858 5.08
1859 5.07
1860 5.07
1861 5.07
1862 5.08
1863 5.09
1864 5.1
1865 5.1
1866 5.11
1867 5.12
1868 5.13
1869 5.14
1870 5.14
1871 5.14
1872 5.13
1873 5.12
1874 5.11
1875 5.1
1876 5.09
1877 5.08
1878 5.07
1879 5.07
1880 5.06
1881 5.04
1882 5.03
1883 5.02
1884 5
1885 4.99
1886 4.97
1887 4.96
1888 4.95
1889 4.93
1890 4.92
1891 4.91
1892 4.9
1893 4.9
1894 4.89
1895 4.88
1896 4.88
1897 4.87
1898 4.86
1899 4.85
1900 4.85
1901 4.76
1902 4.68
1903 4.6
1904 4.52
1905 4.44
1906 4.36
1907 4.27
1908 4.19
1909 4.11
1910 4.03
1911 3.92
1912 3.82
1913 3.71
1914 3.6
1915 3.5
1916 3.39
1917 3.28
1918 3.18
1919 3.07
1920 2.96
1921 3.04
1922 2.88
1923 2.77
1924 2.59
1925 2.48
1926 2.39
1927 2.24
1928 2.21
1929 2.12
1930 2.15
1931 2.03
1932 1.97
1933 1.83
1934 1.77
1935 1.68
1936 1.67
1937 1.69
1938 1.83
1939 1.94
1940 2.22
1941 2.27
1942 2.43
1943 2.8
1944 2.82
1945 2.69
1946 3.28
1947 3.08
1948 2.92
1949 2.77
1950 2.89
1951 2.84
1952 2.75
1953 2.66
1954 2.58
1955 2.51
1956 2.46
1957 2.41
1958 2.36
1959 2.32
1960 2.28
1961 2.24
1962 2.2
1963 2.15
1964 2.1
1965 2.05
1966 2.01
1967 1.99
1968 1.99
1969 2.02
1970 2.06
1971 2.11
1972 2.18
1973 2.24
1974 2.29
1975 2.33
1976 2.35
1977 2.34
1978 2.3
1979 2.25
1980 2.18
1981 2.11
1982 2.04
1983 1.99
1984 1.95
1985 1.93
1986 1.91
1987 1.9
1988 1.88
1989 1.85
1990 1.8
1991 1.74
1992 1.66
1993 1.58
1994 1.48
1995 1.39
1996 1.3
1997 1.22
1998 1.17
1999 1.13
2000 1.12
2001 1.14
2002 1.17
2003 1.21
2004 1.25
2005 1.3
2006 1.35
2007 1.39
2008 1.42
2009 1.45
2010 1.47
2011 1.48
2012 1.49
2013 1.5
2014 1.51
2015 1.52
2016 1.54
2017 1.56
2018 1.57