Year Years
1800 31.7
1801 31.7
1802 31.7
1803 31.7
1804 31.7
1805 31.7
1806 31.7
1807 31.7
1808 31.7
1809 31.7
1810 31.7
1811 31.7
1812 31.7
1813 31.7
1814 31.7
1815 31.7
1816 31.7
1817 31.7
1818 31.7
1819 31.7
1820 31.7
1821 31.7
1822 31.7
1823 31.7
1824 31.7
1825 31.7
1826 31.7
1827 31.7
1828 31.7
1829 31.7
1830 31.7
1831 31.7
1832 31.7
1833 31.7
1834 31.7
1835 31.7
1836 31.7
1837 31.7
1838 31.7
1839 31.7
1840 31.7
1841 31.7
1842 31.7
1843 31.7
1844 31.7
1845 31.7
1846 31.7
1847 31.7
1848 31.7
1849 31.7
1850 31.7
1851 31.7
1852 31.7
1853 31.7
1854 31.7
1855 31.7
1856 31.7
1857 31.7
1858 31.7
1859 31.7
1860 31.7
1861 31.7
1862 31.7
1863 31.7
1864 31.7
1865 31.7
1866 31.7
1867 31.7
1868 31.7
1869 31.7
1870 31.7
1871 31.71
1872 31.72
1873 31.73
1874 31.74
1875 31.75
1876 31.76
1877 31.77
1878 31.78
1879 31.8
1880 31.81
1881 31.82
1882 31.83
1883 31.84
1884 31.85
1885 31.86
1886 31.87
1887 31.88
1888 31.89
1889 31.9
1890 31.91
1891 31.92
1892 31.93
1893 31.94
1894 31.95
1895 31.96
1896 31.98
1897 31.99
1898 32
1899 32.01
1900 32.02
1901 32.03
1902 32.04
1903 32.05
1904 32.06
1905 32.07
1906 32.08
1907 32.09
1908 32.1
1909 32.11
1910 32.12
1911 32.13
1912 32.14
1913 32.16
1914 32.17
1915 32.18
1916 32.19
1917 32.2
1918 26.7
1919 32.22
1920 32.23
1921 32.24
1922 32.25
1923 32.26
1924 32.27
1925 32.28
1926 32.29
1927 32.3
1928 32.31
1929 32.32
1930 32.34
1931 32.35
1932 32.36
1933 32.37
1934 32.38
1935 32.39
1936 33.29
1937 34.19
1938 35.09
1939 35.99
1940 36.89
1941 37.81
1942 38.71
1943 39.61
1944 40.52
1945 41.42
1946 42.33
1947 43.23
1948 44.14
1949 45.05
1950 45.96
1951 46.42
1952 47.32
1953 48.22
1954 49.11
1955 49.98
1956 50.85
1957 51.71
1958 52.56
1959 53.4
1960 54.23
1961 55.06
1962 55.89
1963 56.71
1964 57.52
1965 58.32
1966 59.12
1967 59.9
1968 60.67
1969 61.44
1970 62.18
1971 62.79
1972 63.49
1973 64
1974 64.43
1975 64.75
1976 65.11
1977 65.58
1978 65.92
1979 66.33
1980 66.79
1981 67.24
1982 67.53
1983 68.03
1984 68.71
1985 69.3
1986 69.75
1987 70.38
1988 70.99
1989 71.46
1990 71.8
1991 72.14
1992 72.53
1993 72.5
1994 72.66
1995 72.7
1996 72.68
1997 72.8
1998 72.91
1999 73
2000 73.08
2001 73.16
2002 73.18
2003 73.08
2004 72.98
2005 73.12
2006 73.78
2007 74.4
2008 74.85
2009 75.31
2010 75.78
2011 76.09
2012 76.34
2013 76.5
2014 76.63
2015 76.75
2016 76.35
2017 76.5
2018 76.65