Year Years
1800 25.4
1801 25.4
1802 25.4
1803 25.4
1804 25.4
1805 25.4
1806 25.4
1807 25.4
1808 25.4
1809 25.4
1810 25.4
1811 25.4
1812 25.4
1813 25.4
1814 25.4
1815 25.4
1816 25.4
1817 25.4
1818 25.4
1819 25.4
1820 25.4
1821 25.4
1822 25.4
1823 25.4
1824 25.4
1825 25.4
1826 25.4
1827 25.4
1828 25.4
1829 25.4
1830 25.4
1831 25.4
1832 25.4
1833 25.4
1834 25.4
1835 25.4
1836 25.4
1837 25.4
1838 25.4
1839 25.4
1840 25.4
1841 25.4
1842 25.4
1843 25.4
1844 25.4
1845 25.4
1846 25.4
1847 25.4
1848 25.4
1849 25.4
1850 25.4
1851 25.4
1852 25.4
1853 25.4
1854 25.4
1855 25.4
1856 25.4
1857 25.4
1858 25.4
1859 25.4
1860 25.4
1861 25.4
1862 25.4
1863 25.4
1864 25.4
1865 25.4
1866 25.4
1867 25.4
1868 25.4
1869 25.4
1870 25.4
1871 25.45
1872 25.5
1873 25.54
1874 25.59
1875 25.64
1876 25.69
1877 25.73
1878 25.78
1879 25.83
1880 25.88
1881 25.93
1882 25.97
1883 26.02
1884 26.07
1885 26.12
1886 26.16
1887 26.21
1888 26.26
1889 26.31
1890 26.36
1891 26.4
1892 26.45
1893 26.5
1894 26.55
1895 26.59
1896 26.64
1897 26.69
1898 26.74
1899 26.79
1900 26.83
1901 26.88
1902 26.93
1903 26.98
1904 27.02
1905 27.07
1906 27.12
1907 27.17
1908 27.22
1909 27.26
1910 27.31
1911 27.36
1912 27.41
1913 27.45
1914 27.5
1915 27.55
1916 27.6
1917 27.65
1918 1.09
1919 27.74
1920 27.79
1921 27.84
1922 27.88
1923 27.93
1924 27.98
1925 28.03
1926 28.08
1927 28.12
1928 28.17
1929 28.22
1930 28.27
1931 28.31
1932 28.36
1933 28.41
1934 28.46
1935 29.87
1936 31.3
1937 32.71
1938 34.14
1939 35.58
1940 37.02
1941 38.45
1942 39.9
1943 41.35
1944 42.81
1945 44.26
1946 45.73
1947 47.2
1948 48.68
1949 50.15
1950 51.63
1951 52.02
1952 52.71
1953 53.4
1954 54.09
1955 54.77
1956 55.45
1957 56.14
1958 56.82
1959 57.5
1960 58.17
1961 58.85
1962 59.53
1963 60.22
1964 60.91
1965 61.6
1966 62.3
1967 62.99
1968 63.68
1969 64.39
1970 65.09
1971 65.15
1972 65.16
1973 65.09
1974 65.14
1975 65.6
1976 66.14
1977 66.5
1978 66.94
1979 67.21
1980 67.54
1981 67.67
1982 67.8
1983 67.93
1984 68.07
1985 68.22
1986 68.4
1987 68.59
1988 68.75
1989 68.93
1990 69.08
1991 69.02
1992 69.35
1993 69.49
1994 69.61
1995 69.74
1996 69.91
1997 70.07
1998 70.25
1999 70.33
2000 70.45
2001 70.6
2002 70.75
2003 70.89
2004 71.02
2005 71.16
2006 71.3
2007 71.33
2008 71.43
2009 69.39
2010 71.46
2011 71.46
2012 71.36
2013 71.59
2014 71.64
2015 71.72
2016 71.95
2017 72.17
2018 72.38