Year Years 1800 26.67 1801 26.67 1802 26.67 1803 26.67 1804 26.67 1805 26.67 1806 26.67 1807 26.67 1808 26.67 1809 26.67 1810 26.67 1811 26.67 1812 26.67 1813 26.67 1814 26.67 1815 26.67 1816 26.67 1817 26.67 1818 26.67 1819 26.67 1820 26.67 1821 26.67 1822 26.67 1823 26.67 1824 26.67 1825 26.67 1826 26.67 1827 26.67 1828 26.67 1829 26.67 1830 26.67 1831 26.67 1832 26.67 1833 26.67 1834 26.67 1835 26.67 1836 26.67 1837 26.67 1838 26.67 1839 26.67 1840 26.67 1841 26.67 1842 26.67 1843 26.67 1844 26.67 1845 26.67 1846 26.67 1847 26.67 1848 26.67 1849 26.67 1850 26.67 1851 26.67 1852 26.67 1853 26.67 1854 26.67 1855 26.67 1856 26.67 1857 26.67 1858 26.67 1859 26.67 1860 26.67 1861 26.67 1862 26.67 1863 26.67 1864 26.67 1865 26.67 1866 26.67 1867 26.67 1868 26.67 1869 26.67 1870 26.67 1871 26.77 1872 26.87 1873 26.97 1874 27.07 1875 27.17 1876 27.27 1877 27.36 1878 27.46 1879 27.56 1880 27.66 1881 27.76 1882 27.86 1883 27.96 1884 28.06 1885 28.16 1886 28.26 1887 28.36 1888 28.46 1889 28.55 1890 28.65 1891 28.75 1892 28.85 1893 28.95 1894 29.05 1895 29.15 1896 29.25 1897 29.35 1898 29.45 1899 29.55 1900 29.65 1901 29.74 1902 29.84 1903 29.94 1904 30.04 1905 30.14 1906 30.24 1907 30.34 1908 30.44 1909 30.54 1910 30.64 1911 30.74 1912 30.84 1913 30.93 1914 31.03 1915 31.13 1916 31.23 1917 31.33 1918 12.15 1919 31.53 1920 31.63 1921 31.73 1922 31.83 1923 31.93 1924 32.03 1925 32.12 1926 32.22 1927 32.32 1928 32.42 1929 32.52 1930 32.62 1931 32.72 1932 32.82 1933 32.92 1934 33.02 1935 33.12 1936 33.22 1937 33.31 1938 33.41 1939 33.51 1940 33.61 1941 33.71 1942 33.81 1943 33.91 1944 34.01 1945 34.11 1946 34.21 1947 34.31 1948 34.41 1949 34.5 1950 34.6 1951 35.11 1952 36.02 1953 36.89 1954 37.74 1955 38.56 1956 39.34 1957 40.1 1958 40.84 1959 41.55 1960 42.26 1961 42.94 1962 43.63 1963 44.32 1964 45.02 1965 45.73 1966 46.42 1967 47.11 1968 47.78 1969 48.45 1970 49.1 1971 47.85 1972 48.1 1973 49.81 1974 50.06 1975 50.27 1976 50.36 1977 50.69 1978 50.87 1979 51.04 1980 51.19 1981 51.33 1982 51.43 1983 51.15 1984 51.3 1985 51.44 1986 51.62 1987 51.86 1988 52.09 1989 51.42 1990 51.58 1991 51.86 1992 52.33 1993 51.54 1994 53.45 1995 53.37 1996 53.14 1997 53.12 1998 53.34 1999 54.59 2000 54.52 2001 54.65 2002 54.99 2003 56.02 2004 56.04 2005 56.6 2006 56.77 2007 57.13 2008 57.53 2009 57.49 2010 58.13 2011 58.08 2012 58.41 2013 58.57 2014 58.74 2015 58.9 2016 59.72 2017 60.22 2018 60.72