Year Years
1800 32.3
1801 32.3
1802 32.3
1803 32.3
1804 32.3
1805 32.3
1806 32.3
1807 32.3
1808 32.3
1809 32.3
1810 32.3
1811 32.3
1812 32.3
1813 32.3
1814 32.3
1815 32.3
1816 32.3
1817 32.3
1818 32.3
1819 32.3
1820 32.3
1821 32.3
1822 32.3
1823 32.3
1824 32.3
1825 32.3
1826 32.3
1827 32.3
1828 32.3
1829 32.3
1830 32.3
1831 32.3
1832 32.3
1833 32.3
1834 32.3
1835 32.3
1836 32.3
1837 32.3
1838 32.3
1839 32.3
1840 32.3
1841 32.3
1842 32.3
1843 32.3
1844 32.3
1845 32.3
1846 32.3
1847 32.3
1848 32.3
1849 32.3
1850 32.3
1851 32.3
1852 32.3
1853 32.3
1854 32.3
1855 32.3
1856 32.3
1857 32.3
1858 32.3
1859 32.3
1860 32.3
1861 32.3
1862 32.3
1863 32.3
1864 32.3
1865 32.3
1866 32.3
1867 32.3
1868 32.3
1869 32.3
1870 32.3
1871 32.3
1872 32.3
1873 32.31
1874 32.31
1875 32.31
1876 32.31
1877 32.32
1878 32.32
1879 32.32
1880 32.32
1881 32.33
1882 32.33
1883 32.33
1884 32.33
1885 32.33
1886 32.34
1887 32.34
1888 32.34
1889 32.34
1890 32.35
1891 32.35
1892 32.35
1893 32.35
1894 32.36
1895 32.36
1896 32.36
1897 32.36
1898 32.37
1899 32.37
1900 32.37
1901 32.37
1902 32.37
1903 32.38
1904 32.38
1905 32.38
1906 32.38
1907 32.39
1908 32.39
1909 32.39
1910 32.39
1911 32.4
1912 32.4
1913 32.4
1914 32.4
1915 32.4
1916 32.41
1917 32.41
1918 26.87
1919 32.41
1920 32.42
1921 32.42
1922 32.42
1923 32.42
1924 32.43
1925 32.43
1926 32.43
1927 32.43
1928 32.43
1929 32.44
1930 32.44
1931 32.44
1932 32.44
1933 32.45
1934 32.45
1935 32.45
1936 32.45
1937 32.46
1938 32.46
1939 32.46
1940 32.46
1941 32.47
1942 32.47
1943 32.47
1944 32.47
1945 32.47
1946 32.86
1947 33.24
1948 33.63
1949 34
1950 34.39
1951 34.86
1952 35.81
1953 36.75
1954 37.67
1955 38.57
1956 39.47
1957 40.36
1958 41.24
1959 42.1
1960 42.95
1961 43.78
1962 44.6
1963 45.41
1964 46.21
1965 46.99
1966 47.74
1967 48.48
1968 49.2
1969 49.93
1970 50.67
1971 52.12
1972 52.8
1973 53.84
1974 55.09
1975 56.32
1976 58.27
1977 59.19
1978 60.48
1979 61.53
1980 62.6
1981 63.65
1982 64.69
1983 65.74
1984 66.69
1985 67.64
1986 68.45
1987 69.1
1988 69.63
1989 70.13
1990 70.7
1991 71.2
1992 71.7
1993 72.16
1994 72.52
1995 72.88
1996 73.25
1997 73.63
1998 73.98
1999 74.3
2000 74.55
2001 74.78
2002 75
2003 75.23
2004 75.65
2005 76.02
2006 76.13
2007 76.14
2008 76.42
2009 76.27
2010 76.09
2011 76.38
2012 76.73
2013 76.94
2014 77.16
2015 77.38
2016 77.6
2017 77.83
2018 78.06