Year Total
1800 4.85
1801 4.85
1802 4.84
1803 4.84
1804 4.83
1805 4.83
1806 4.82
1807 4.82
1808 4.82
1809 4.81
1810 4.81
1811 4.8
1812 4.8
1813 4.79
1814 4.79
1815 4.78
1816 4.78
1817 4.78
1818 4.77
1819 4.77
1820 4.76
1821 4.76
1822 4.75
1823 4.75
1824 4.75
1825 4.74
1826 4.74
1827 4.73
1828 4.73
1829 4.72
1830 4.72
1831 4.77
1832 4.82
1833 4.87
1834 4.92
1835 4.97
1836 4.97
1837 4.98
1838 4.98
1839 4.99
1840 5
1841 4.94
1842 4.88
1843 4.82
1844 4.76
1845 4.7
1846 4.64
1847 4.58
1848 4.51
1849 4.45
1850 4.38
1851 4.32
1852 4.25
1853 4.18
1854 4.25
1855 4.31
1856 4.38
1857 4.44
1858 4.51
1859 4.53
1860 4.56
1861 4.58
1862 4.61
1863 4.63
1864 4.66
1865 4.68
1866 4.71
1867 4.73
1868 4.76
1869 4.78
1870 4.8
1871 4.83
1872 4.85
1873 4.87
1874 4.85
1875 4.83
1876 4.82
1877 4.8
1878 4.78
1879 4.75
1880 4.71
1881 4.68
1882 4.64
1883 4.61
1884 4.55
1885 4.49
1886 4.42
1887 4.36
1888 4.3
1889 4.27
1890 4.25
1891 4.22
1892 4.2
1893 4.17
1894 4.13
1895 4.09
1896 4.06
1897 4.02
1898 3.98
1899 3.91
1900 3.84
1901 3.79
1902 3.73
1903 3.68
1904 3.63
1905 3.57
1906 3.52
1907 3.47
1908 3.42
1909 3.36
1910 3.31
1911 3.26
1912 3.2
1913 3.15
1914 3.1
1915 3.04
1916 2.99
1917 2.94
1918 2.89
1919 2.83
1920 2.78
1921 2.73
1922 2.67
1923 2.62
1924 2.57
1925 2.51
1926 2.46
1927 2.41
1928 2.36
1929 2.3
1930 2.25
1931 2.22
1932 2.19
1933 2.08
1934 2.04
1935 1.94
1936 1.95
1937 1.99
1938 2.11
1939 2.1
1940 1.84
1941 1.66
1942 1.81
1943 2.07
1944 2.13
1945 2.18
1946 2.54
1947 2.48
1948 2.46
1949 2.41
1950 2.31
1951 2.32
1952 2.34
1953 2.36
1954 2.39
1955 2.42
1956 2.46
1957 2.49
1958 2.53
1959 2.57
1960 2.6
1961 2.62
1962 2.63
1963 2.62
1964 2.6
1965 2.56
1966 2.5
1967 2.43
1968 2.36
1969 2.28
1970 2.21
1971 2.13
1972 2.05
1973 1.98
1974 1.91
1975 1.84
1976 1.78
1977 1.73
1978 1.69
1979 1.66
1980 1.63
1981 1.61
1982 1.59
1983 1.58
1984 1.57
1985 1.57
1986 1.56
1987 1.56
1988 1.57
1989 1.57
1990 1.58
1991 1.59
1992 1.6
1993 1.6
1994 1.61
1995 1.61
1996 1.61
1997 1.61
1998 1.61
1999 1.62
2000 1.63
2001 1.65
2002 1.68
2003 1.7
2004 1.73
2005 1.76
2006 1.78
2007 1.8
2008 1.81
2009 1.81
2010 1.81
2011 1.8
2012 1.8
2013 1.79
2014 1.79
2015 1.79
2016 1.79
2017 1.79
2018 1.8