Year Years
1800 38.5
1801 38.5
1802 38.5
1803 38.5
1804 38.5
1805 38.5
1806 38.5
1807 38.5
1808 38.5
1809 38.5
1810 38.5
1811 38.5
1812 38.5
1813 38.5
1814 38.5
1815 38.5
1816 38.5
1817 38.5
1818 38.5
1819 38.5
1820 38.5
1821 38.5
1822 38.5
1823 38.5
1824 38.5
1825 38.5
1826 38.5
1827 38.5
1828 38.5
1829 38.5
1830 38.5
1831 38.5
1832 38.5
1833 38.5
1834 38.5
1835 38.5
1836 38.5
1837 38.5
1838 38.5
1839 38.5
1840 38.51
1841 38.51
1842 38.51
1843 38.51
1844 38.51
1845 38.51
1846 38.51
1847 38.51
1848 38.51
1849 38.51
1850 38.51
1851 38.51
1852 38.51
1853 38.51
1854 38.51
1855 38.51
1856 38.51
1857 38.51
1858 38.51
1859 38.51
1860 38.51
1861 38.51
1862 38.51
1863 38.51
1864 38.51
1865 38.51
1866 38.51
1867 38.51
1868 38.51
1869 38.51
1870 38.51
1871 38.5
1872 38.49
1873 38.47
1874 38.46
1875 38.45
1876 38.44
1877 38.43
1878 38.41
1879 38.4
1880 38.39
1881 38.38
1882 38.37
1883 38.35
1884 38.34
1885 38.33
1886 38.32
1887 38.31
1888 38.29
1889 38.28
1890 38.27
1891 38.26
1892 38.25
1893 38.23
1894 38.22
1895 38.21
1896 38.84
1897 39.47
1898 40.11
1899 40.74
1900 41.37
1901 41.99
1902 42.62
1903 43.25
1904 43.88
1905 44.51
1906 44.74
1907 44.96
1908 45.2
1909 45.43
1910 45.65
1911 45.88
1912 46.11
1913 46.34
1914 46.57
1915 46.79
1916 46.88
1917 46.96
1918 25.77
1919 47.13
1920 47.21
1921 47.29
1922 47.38
1923 47.46
1924 47.54
1925 47.63
1926 47.61
1927 47.6
1928 47.58
1929 47.57
1930 47.55
1931 47.54
1932 47.52
1933 47.51
1934 47.49
1935 47.48
1936 47.46
1937 47.45
1938 48.25
1939 49.05
1940 49.85
1941 50.65
1942 51.45
1943 52.24
1944 53.95
1945 55.66
1946 57.37
1947 59.07
1948 60.78
1949 62.49
1950 64.19
1951 64.4
1952 64.82
1953 65.22
1954 65.61
1955 65.99
1956 66.35
1957 66.7
1958 67.02
1959 67.35
1960 67.66
1961 67.96
1962 68.25
1963 68.54
1964 68.82
1965 69.09
1966 69.35
1967 69.6
1968 69.84
1969 70.08
1970 70.31
1971 70.56
1972 70.73
1973 70.91
1974 51.44
1975 71.15
1976 71.26
1977 72.17
1978 72.59
1979 73.01
1980 72.84
1981 73.32
1982 73.45
1983 73.84
1984 73.88
1985 74.04
1986 74.37
1987 74.14
1988 74.4
1989 74.6
1990 74.93
1991 74.97
1992 75.26
1993 75.5
1994 75.43
1995 75.72
1996 76.12
1997 76.24
1998 76.39
1999 76.63
2000 76.83
2001 77.27
2002 77.47
2003 77.74
2004 77.92
2005 78.04
2006 78.66
2007 78.95
2008 79.25
2009 79.56
2010 79.88
2011 80.22
2012 80.58
2013 80.64
2014 80.5
2015 80.47
2016 80.47
2017 80.63
2018 80.79