Year Years
1800 31.1
1801 31.1
1802 31.1
1803 31.1
1804 31.1
1805 31.1
1806 31.1
1807 31.1
1808 31.1
1809 31.1
1810 31.1
1811 31.1
1812 31.1
1813 31.1
1814 31.1
1815 31.1
1816 31.1
1817 31.1
1818 31.1
1819 31.1
1820 31.1
1821 31.1
1822 31.1
1823 31.1
1824 31.1
1825 31.1
1826 31.1
1827 31.1
1828 31.1
1829 31.1
1830 31.1
1831 31.1
1832 31.1
1833 31.1
1834 31.1
1835 31.1
1836 31.1
1837 31.1
1838 31.1
1839 31.1
1840 31.1
1841 31.1
1842 31.1
1843 31.1
1844 31.1
1845 31.1
1846 31.1
1847 31.1
1848 31.1
1849 31.1
1850 31.1
1851 31.1
1852 31.1
1853 31.1
1854 31.1
1855 31.1
1856 31.1
1857 31.1
1858 31.1
1859 31.1
1860 31.1
1861 31.1
1862 31.1
1863 31.1
1864 31.1
1865 31.1
1866 31.1
1867 31.1
1868 31.1
1869 31.1
1870 31.1
1871 31.17
1872 31.23
1873 31.3
1874 31.36
1875 31.43
1876 31.49
1877 31.56
1878 31.63
1879 31.69
1880 31.76
1881 31.82
1882 31.89
1883 31.95
1884 32.02
1885 32.08
1886 32.15
1887 32.22
1888 32.28
1889 32.35
1890 32.41
1891 32.48
1892 32.54
1893 32.61
1894 32.68
1895 32.74
1896 32.81
1897 32.87
1898 32.94
1899 33
1900 33.07
1901 33.14
1902 33.2
1903 33.27
1904 33.33
1905 33.4
1906 33.46
1907 33.53
1908 33.59
1909 33.66
1910 33.73
1911 33.79
1912 33.86
1913 33.92
1914 33.99
1915 34.05
1916 34.12
1917 34.19
1918 13.25
1919 34.32
1920 34.38
1921 34.45
1922 34.51
1923 34.58
1924 34.65
1925 34.71
1926 34.78
1927 34.84
1928 34.91
1929 34.97
1930 35.04
1931 35.1
1932 35.17
1933 35.24
1934 35.3
1935 35.37
1936 35.43
1937 35.5
1938 35.56
1939 35.63
1940 35.7
1941 35.76
1942 35.83
1943 35.89
1944 35.96
1945 36.02
1946 36.46
1947 36.9
1948 37.33
1949 37.77
1950 38.21
1951 38.41
1952 38.74
1953 39.05
1954 39.37
1955 39.68
1956 39.97
1957 40.28
1958 40.58
1959 40.91
1960 41.26
1961 41.65
1962 42.11
1963 42.63
1964 43.2
1965 43.84
1966 44.53
1967 45.25
1968 45.99
1969 46.75
1970 47.54
1971 47.97
1972 48.5
1973 48.95
1974 49.43
1975 49.83
1976 50.25
1977 50.6
1978 50.93
1979 51.3
1980 51.48
1981 51.72
1982 51.87
1983 52.07
1984 52.21
1985 52.33
1986 52.48
1987 52.64
1988 52.96
1989 53.24
1990 49.88
1991 52.59
1992 52.68
1993 50.56
1994 48.95
1995 50.32
1996 49.26
1997 52.36
1998 52.63
1999 53.62
2000 54.47
2001 55.29
2002 54.88
2003 54.88
2004 57.57
2005 58.17
2006 58.67
2007 59.18
2008 59.76
2009 60.26
2010 60.77
2011 61.39
2012 62.11
2013 62.74
2014 59.38
2015 63.83
2016 64.41
2017 64.92
2018 65.43