Year Years
1800 26
1801 26
1802 26
1803 26
1804 26
1805 26
1806 26
1807 26
1808 26
1809 26
1810 26
1811 26
1812 26
1813 26
1814 26
1815 26
1816 26
1817 26
1818 26
1819 26
1820 26
1821 26
1822 26
1823 26
1824 26
1825 26
1826 26
1827 26
1828 26
1829 26
1830 26
1831 26
1832 26
1833 26
1834 26
1835 26
1836 26
1837 26
1838 26
1839 26
1840 26
1841 26
1842 26
1843 26
1844 26
1845 26
1846 26
1847 26
1848 26
1849 26
1850 26
1851 26
1852 26
1853 26
1854 26
1855 26
1856 26
1857 26
1858 26
1859 26
1860 26
1861 26
1862 26
1863 26
1864 26
1865 26
1866 26
1867 26
1868 26
1869 26
1870 26
1871 26
1872 26
1873 26
1874 26
1875 26
1876 26
1877 26
1878 16
1879 26
1880 26
1881 26
1882 26
1883 26
1884 26
1885 26
1886 26
1887 26
1888 26
1889 26
1890 26
1891 26
1892 26
1893 26
1894 26
1895 26
1896 26
1897 26
1898 26
1899 26
1900 26
1901 26
1902 26
1903 26
1904 26
1905 26
1906 26
1907 26
1908 26
1909 26
1910 26
1911 26
1912 26
1913 26
1914 26
1915 26
1916 26
1917 26
1918 26
1919 26
1920 26
1921 26
1922 26
1923 26
1924 26
1925 26
1926 26.92
1927 27.85
1928 28.77
1929 29.69
1930 30.62
1931 31.54
1932 32.46
1933 33.39
1934 34.31
1935 35.23
1936 36.16
1937 37.08
1938 38.01
1939 38.93
1940 39.85
1941 40.78
1942 41.7
1943 42.62
1944 43.55
1945 44.47
1946 45.39
1947 46.32
1948 47.24
1949 48.16
1950 49.09
1951 49.51
1952 50.34
1953 51.16
1954 51.96
1955 52.74
1956 53.5
1957 54.25
1958 54.98
1959 55.69
1960 56.38
1961 57.06
1962 57.72
1963 58.36
1964 58.99
1965 59.6
1966 60.19
1967 60.77
1968 61.33
1969 61.89
1970 62.42
1971 62.95
1972 63.46
1973 63.95
1974 64.44
1975 64.91
1976 65.37
1977 65.81
1978 66.25
1979 66.68
1980 67.09
1981 67.5
1982 67.89
1983 68.28
1984 68.65
1985 69.02
1986 69.37
1987 69.72
1988 70.05
1989 70.38
1990 70.7
1991 71.01
1992 71.31
1993 71.6
1994 71.89
1995 72.16
1996 72.43
1997 72.7
1998 72.95
1999 73.21
2000 73.46
2001 73.7
2002 73.94
2003 74.17
2004 74.4
2005 74.62
2006 74.84
2007 75.05
2008 75.26
2009 75.47
2010 75.67
2011 75.88
2012 76.09
2013 76.31
2014 76.52
2015 76.74
2016 76.93
2017 77.12
2018 77.31