Year Years
1800 31.8
1801 31.8
1802 31.8
1803 31.8
1804 31.8
1805 31.8
1806 31.8
1807 31.8
1808 31.8
1809 31.8
1810 31.8
1811 31.8
1812 31.8
1813 31.8
1814 31.8
1815 31.8
1816 31.8
1817 31.8
1818 31.8
1819 31.8
1820 31.8
1821 31.8
1822 31.8
1823 31.8
1824 31.8
1825 31.8
1826 31.8
1827 31.8
1828 31.8
1829 31.8
1830 31.8
1831 31.8
1832 31.8
1833 31.8
1834 31.8
1835 31.8
1836 31.8
1837 31.8
1838 31.8
1839 31.8
1840 31.8
1841 31.8
1842 31.8
1843 31.8
1844 31.8
1845 31.8
1846 31.8
1847 31.8
1848 31.8
1849 31.8
1850 31.8
1851 31.8
1852 31.8
1853 31.8
1854 31.8
1855 31.8
1856 31.8
1857 31.8
1858 31.8
1859 31.8
1860 31.8
1861 31.8
1862 31.8
1863 31.8
1864 31.8
1865 31.8
1866 31.8
1867 31.8
1868 31.8
1869 31.8
1870 31.8
1871 31.8
1872 31.79
1873 31.79
1874 31.78
1875 31.78
1876 31.77
1877 31.77
1878 31.76
1879 31.76
1880 31.75
1881 31.75
1882 31.74
1883 31.74
1884 31.73
1885 31.73
1886 31.72
1887 31.72
1888 31.71
1889 31.71
1890 31.7
1891 31.7
1892 31.69
1893 31.69
1894 31.68
1895 31.68
1896 31.67
1897 31.67
1898 31.66
1899 31.66
1900 31.65
1901 31.65
1902 31.64
1903 31.64
1904 31.64
1905 31.63
1906 31.63
1907 31.62
1908 31.62
1909 31.61
1910 31.61
1911 31.6
1912 31.6
1913 31.59
1914 31.59
1915 31.58
1916 31.58
1917 31.57
1918 20.23
1919 31.56
1920 31.56
1921 31.55
1922 31.55
1923 31.54
1924 31.54
1925 31.53
1926 31.53
1927 31.52
1928 31.52
1929 31.51
1930 31.51
1931 31.5
1932 31.5
1933 31.49
1934 31.49
1935 31.48
1936 31.48
1937 31.48
1938 31.47
1939 31.47
1940 31.46
1941 31.46
1942 31.45
1943 31.45
1944 31.44
1945 31.44
1946 33.55
1947 35.67
1948 37.78
1949 39.89
1950 42
1951 42.11
1952 42.38
1953 42.75
1954 43.21
1955 43.78
1956 44.42
1957 45.16
1958 45.98
1959 46.84
1960 47.73
1961 48.62
1962 49.49
1963 50.29
1964 51.03
1965 51.7
1966 52.32
1967 52.91
1968 53.48
1969 54.01
1970 54.52
1971 55.26
1972 55.98
1973 56.72
1974 57.41
1975 58.02
1976 58.19
1977 58.38
1978 58.57
1979 58.76
1980 58.98
1981 59.22
1982 59.55
1983 59.94
1984 60.41
1985 60.87
1986 61.45
1987 61.98
1988 62.16
1989 62.34
1990 62.52
1991 62.56
1992 62.45
1993 62.24
1994 62.08
1995 61.73
1996 61.55
1997 61.71
1998 61.99
1999 62.41
2000 62.82
2001 63.15
2002 63.38
2003 63.53
2004 63.71
2005 63.99
2006 64.5
2007 65.11
2008 65.64
2009 65.94
2010 66.18
2011 66.59
2012 67.05
2013 67.56
2014 68.04
2015 68.21
2016 68.34
2017 68.52
2018 68.69