Year Years
1800 32.1
1801 32.1
1802 32.1
1803 32.1
1804 32.1
1805 32.1
1806 32.1
1807 32.1
1808 32.1
1809 32.1
1810 32.1
1811 32.1
1812 32.1
1813 32.1
1814 32.1
1815 32.1
1816 32.1
1817 32.1
1818 32.1
1819 32.1
1820 32.1
1821 32.1
1822 32.1
1823 32.1
1824 32.1
1825 32.1
1826 32.1
1827 32.1
1828 32.1
1829 32.1
1830 32.1
1831 32.1
1832 32.1
1833 32.1
1834 32.1
1835 32.1
1836 32.1
1837 32.1
1838 32.1
1839 32.1
1840 32.1
1841 32.1
1842 32.1
1843 32.1
1844 32.1
1845 32.1
1846 32.1
1847 32.1
1848 32.1
1849 32.1
1850 32.1
1851 32.1
1852 32.1
1853 32.1
1854 32.1
1855 32.1
1856 32.1
1857 32.1
1858 32.1
1859 32.1
1860 32.1
1861 32.1
1862 32.1
1863 32.1
1864 32.1
1865 32.1
1866 32.1
1867 32.1
1868 32.1
1869 32.1
1870 32.1
1871 32.12
1872 32.15
1873 32.17
1874 32.19
1875 32.21
1876 32.24
1877 32.26
1878 32.28
1879 32.31
1880 32.33
1881 32.35
1882 32.38
1883 32.4
1884 32.42
1885 32.44
1886 32.47
1887 32.49
1888 32.51
1889 32.54
1890 32.56
1891 32.58
1892 32.61
1893 32.63
1894 32.65
1895 32.67
1896 32.7
1897 32.72
1898 32.74
1899 32.77
1900 32.79
1901 32.81
1902 32.84
1903 32.86
1904 32.88
1905 32.9
1906 32.93
1907 32.95
1908 32.97
1909 33
1910 33.02
1911 33.04
1912 33.07
1913 33.09
1914 33.11
1915 33.13
1916 33.16
1917 33.18
1918 12.84
1919 33.23
1920 33.25
1921 33.27
1922 33.3
1923 33.32
1924 33.34
1925 33.36
1926 33.39
1927 33.41
1928 33.43
1929 33.46
1930 33.48
1931 33.5
1932 33.52
1933 33.55
1934 33.57
1935 33.59
1936 33.62
1937 33.64
1938 33.66
1939 33.69
1940 33.71
1941 33.73
1942 33.75
1943 33.78
1944 33.8
1945 33.82
1946 35.53
1947 37.25
1948 38.96
1949 40.68
1950 42.4
1951 42.58
1952 42.93
1953 43.3
1954 43.68
1955 44.08
1956 44.49
1957 44.91
1958 45.35
1959 45.79
1960 46.25
1961 46.71
1962 47.15
1963 47.61
1964 48.07
1965 48.53
1966 49.01
1967 49.52
1968 50.03
1969 50.58
1970 51.14
1971 51.53
1972 51.88
1973 52.23
1974 52.6
1975 52.94
1976 53.23
1977 53.52
1978 53.79
1979 54.13
1980 54.49
1981 54.9
1982 55.33
1983 55.59
1984 56.2
1985 56.6
1986 57
1987 57.38
1988 57.93
1989 58.15
1990 58.63
1991 58.92
1992 59.24
1993 59.54
1994 59.73
1995 59.99
1996 59.27
1997 60.18
1998 60.19
1999 61.26
2000 61.48
2001 62.39
2002 62.7
2003 63.52
2004 63.97
2005 64.29
2006 64.54
2007 64.7
2008 65.29
2009 64.92
2010 65.93
2011 65.63
2012 66.21
2013 66.53
2014 66.97
2015 67.27
2016 67.56
2017 67.78
2018 68