Year Total
1800 4.96
1801 4.93
1802 4.9
1803 4.87
1804 4.84
1805 4.82
1806 4.79
1807 4.76
1808 4.73
1809 4.7
1810 4.68
1811 4.65
1812 4.62
1813 4.59
1814 4.56
1815 4.53
1816 4.51
1817 4.48
1818 4.45
1819 4.51
1820 4.58
1821 4.64
1822 4.7
1823 4.77
1824 4.83
1825 4.89
1826 4.96
1827 5.02
1828 5.08
1829 5.15
1830 5.21
1831 5.27
1832 5.34
1833 5.4
1834 5.4
1835 5.39
1836 5.39
1837 5.38
1838 5.38
1839 5.37
1840 5.37
1841 5.36
1842 5.36
1843 5.35
1844 5.35
1845 5.34
1846 5.34
1847 5.33
1848 5.33
1849 5.32
1850 5.32
1851 5.31
1852 5.31
1853 5.3
1854 5.3
1855 5.29
1856 5.29
1857 5.28
1858 5.28
1859 5.27
1860 5.27
1861 5.26
1862 5.26
1863 5.25
1864 5.25
1865 5.24
1866 5.24
1867 5.23
1868 5.23
1869 5.22
1870 5.22
1871 5.21
1872 5.21
1873 5.2
1874 5.2
1875 5.19
1876 5.18
1877 5.18
1878 5.17
1879 5.17
1880 5.16
1881 5.16
1882 5.15
1883 5.15
1884 5.14
1885 5.14
1886 5.13
1887 5.13
1888 5.12
1889 5.12
1890 5.11
1891 5.11
1892 5.1
1893 5.1
1894 5.09
1895 5.09
1896 5.08
1897 5.08
1898 5.07
1899 5.07
1900 5.06
1901 5.06
1902 5.05
1903 5.05
1904 5.04
1905 5.04
1906 5.03
1907 5.03
1908 5.02
1909 5.02
1910 5.01
1911 5.01
1912 5
1913 5
1914 4.99
1915 4.99
1916 4.98
1917 4.99
1918 5
1919 5.01
1920 5.03
1921 4.96
1922 4.89
1923 4.82
1924 4.75
1925 4.68
1926 4.62
1927 4.56
1928 4.5
1929 4.44
1930 4.38
1931 4.35
1932 4.32
1933 4.29
1934 4.26
1935 4.23
1936 4.26
1937 4.28
1938 4.3
1939 4.32
1940 4.34
1941 4.34
1942 4.34
1943 4.33
1944 4.33
1945 4.33
1946 4.37
1947 4.4
1948 4.44
1949 4.48
1950 4.52
1951 4.49
1952 4.43
1953 4.39
1954 4.36
1955 4.34
1956 4.33
1957 4.33
1958 4.33
1959 4.34
1960 4.33
1961 4.31
1962 4.27
1963 4.2
1964 4.09
1965 3.96
1966 3.81
1967 3.64
1968 3.46
1969 3.28
1970 3.11
1971 2.95
1972 2.79
1973 2.65
1974 2.51
1975 2.39
1976 2.29
1977 2.2
1978 2.12
1979 2.06
1980 2
1981 1.96
1982 1.92
1983 1.89
1984 1.86
1985 1.83
1986 1.81
1987 1.78
1988 1.77
1989 1.75
1990 1.74
1991 1.73
1992 1.73
1993 1.73
1994 1.73
1995 1.73
1996 1.73
1997 1.74
1998 1.74
1999 1.74
2000 1.74
2001 1.75
2002 1.75
2003 1.75
2004 1.76
2005 1.76
2006 1.76
2007 1.77
2008 1.77
2009 1.78
2010 1.78
2011 1.79
2012 1.79
2013 1.79
2014 1.79
2015 1.8
2016 1.8
2017 1.8
2018 1.8