Year Total
1800 5.4
1801 5.4
1802 5.39
1803 5.39
1804 5.38
1805 5.38
1806 5.37
1807 5.37
1808 5.36
1809 5.36
1810 5.35
1811 5.35
1812 5.34
1813 5.34
1814 5.33
1815 5.33
1816 5.32
1817 5.32
1818 5.33
1819 5.35
1820 5.37
1821 5.35
1822 5.33
1823 5.31
1824 5.28
1825 5.26
1826 5.17
1827 5.07
1828 4.97
1829 4.88
1830 4.78
1831 4.8
1832 4.83
1833 4.85
1834 4.88
1835 4.9
1836 4.9
1837 4.9
1838 4.9
1839 4.9
1840 4.9
1841 4.92
1842 4.95
1843 4.97
1844 5
1845 5.02
1846 5.02
1847 5.02
1848 5.01
1849 5.01
1850 5.01
1851 4.87
1852 4.74
1853 4.6
1854 4.47
1855 4.33
1856 4.45
1857 4.56
1858 4.67
1859 4.79
1860 4.9
1861 4.93
1862 4.96
1863 5
1864 5.03
1865 5.06
1866 5.09
1867 5.11
1868 5.13
1869 5.16
1870 5.18
1871 5.24
1872 5.3
1873 5.35
1874 5.41
1875 5.46
1876 5.38
1877 5.3
1878 5.22
1879 5.14
1880 5.06
1881 5.14
1882 5.21
1883 5.29
1884 5.28
1885 5.26
1886 5.25
1887 5.23
1888 5.22
1889 5.21
1890 5.2
1891 5.18
1892 5.17
1893 5.16
1894 5.14
1895 5.11
1896 5.09
1897 5.06
1898 5.04
1899 4.99
1900 4.93
1901 4.88
1902 4.82
1903 4.77
1904 4.68
1905 4.6
1906 4.51
1907 4.43
1908 4.34
1909 4.18
1910 4.01
1911 3.85
1912 3.68
1913 3.52
1914 3.27
1915 3.02
1916 2.76
1917 2.51
1918 2.26
1919 2.33
1920 2.4
1921 2.48
1922 2.55
1923 2.62
1924 2.42
1925 2.21
1926 2.1
1927 1.98
1928 1.99
1929 1.93
1930 1.88
1931 1.71
1932 1.62
1933 1.58
1934 1.93
1935 2.03
1936 2.07
1937 2.09
1938 2.25
1939 2.39
1940 2.4
1941 2.25
1942 1.83
1943 2
1944 1.89
1945 1.53
1946 2.01
1947 2.04
1948 2.1
1949 2.16
1950 2.08
1951 2.09
1952 2.11
1953 2.14
1954 2.17
1955 2.2
1956 2.23
1957 2.27
1958 2.31
1959 2.35
1960 2.4
1961 2.43
1962 2.47
1963 2.49
1964 2.5
1965 2.48
1966 2.44
1967 2.37
1968 2.28
1969 2.17
1970 2.04
1971 1.92
1972 1.8
1973 1.7
1974 1.62
1975 1.56
1976 1.53
1977 1.5
1978 1.49
1979 1.48
1980 1.47
1981 1.47
1982 1.46
1983 1.46
1984 1.46
1985 1.45
1986 1.44
1987 1.43
1988 1.41
1989 1.38
1990 1.36
1991 1.34
1992 1.32
1993 1.31
1994 1.31
1995 1.31
1996 1.32
1997 1.33
1998 1.34
1999 1.35
2000 1.35
2001 1.35
2002 1.35
2003 1.35
2004 1.35
2005 1.35
2006 1.36
2007 1.36
2008 1.37
2009 1.38
2010 1.39
2011 1.41
2012 1.42
2013 1.43
2014 1.44
2015 1.45
2016 1.46
2017 1.47
2018 1.48