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 32.17
1872 32.24
1873 32.32
1874 32.39
1875 32.46
1876 32.53
1877 32.61
1878 32.68
1879 32.75
1880 32.82
1881 32.89
1882 32.97
1883 33.04
1884 33.11
1885 33.18
1886 33.26
1887 33.33
1888 33.4
1889 33.47
1890 33.54
1891 33.62
1892 33.69
1893 33.76
1894 33.83
1895 33.91
1896 33.98
1897 34.05
1898 34.12
1899 34.19
1900 34.27
1901 34.34
1902 34.41
1903 34.48
1904 34.56
1905 34.63
1906 34.7
1907 34.77
1908 34.85
1909 34.92
1910 34.99
1911 35.06
1912 35.13
1913 35.21
1914 35.28
1915 35.35
1916 35.42
1917 35.5
1918 29.48
1919 35.64
1920 35.71
1921 35.78
1922 35.86
1923 35.93
1924 36
1925 36.07
1926 36.15
1927 36.22
1928 36.29
1929 36.36
1930 36.43
1931 36.51
1932 36.58
1933 36.65
1934 36.72
1935 36.8
1936 36.87
1937 36.94
1938 37.01
1939 37.08
1940 37.16
1941 37.23
1942 37.3
1943 37.37
1944 37.45
1945 37.52
1946 39.66
1947 41.83
1948 43.99
1949 46.17
1950 48.35
1951 48.73
1952 49.4
1953 50.07
1954 50.74
1955 51.42
1956 52.1
1957 52.78
1958 53.48
1959 54.18
1960 54.88
1961 55.6
1962 56.33
1963 57.09
1964 57.89
1965 58.76
1966 59.72
1967 60.77
1968 61.93
1969 63.19
1970 64.55
1971 65.23
1972 66.16
1973 67.03
1974 67.98
1975 68.64
1976 69.25
1977 69.84
1978 70.24
1979 70.52
1980 71.06
1981 71.5
1982 71.69
1983 71.83
1984 71.93
1985 72.02
1986 72.13
1987 72.2
1988 72.31
1989 72.27
1990 72.07
1991 72.39
1992 72.58
1993 72.72
1994 72.8
1995 72.87
1996 72.91
1997 72.85
1998 72.81
1999 72.81
2000 73.01
2001 73.13
2002 73.28
2003 73.45
2004 73.64
2005 73.88
2006 74.13
2007 74.42
2008 74.69
2009 74.88
2010 75.13
2011 75.35
2012 75.6
2013 76.09
2014 76.57
2015 76.75
2016 77.32
2017 77.48
2018 77.64