Year Years 1800 32 1801 32 1802 32 1803 32 1804 32 1805 32 1806 32 1807 32 1808 32 1809 32 1810 32 1811 32 1812 32 1813 32 1814 32 1815 32 1816 32 1817 32 1818 32 1819 32 1820 32 1821 32 1822 32 1823 32 1824 32 1825 32 1826 31.99 1827 31.99 1828 31.99 1829 31.99 1830 31.99 1831 31.99 1832 31.99 1833 31.99 1834 31.99 1835 31.99 1836 31.99 1837 31.99 1838 31.99 1839 31.99 1840 31.99 1841 31.99 1842 31.99 1843 31.99 1844 31.99 1845 31.99 1846 31.99 1847 31.99 1848 31.99 1849 31.99 1850 31.99 1851 31.99 1852 31.99 1853 31.99 1854 31.99 1855 31.99 1856 31.99 1857 31.99 1858 31.99 1859 31.99 1860 31.99 1861 31.99 1862 31.99 1863 31.99 1864 31.99 1865 31.99 1866 31.99 1867 31.99 1868 31.99 1869 31.99 1870 31.99 1871 32 1872 32.02 1873 32.03 1874 32.05 1875 32.06 1876 32.07 1877 32.09 1878 32.09 1879 32.1 1880 32.12 1881 32.13 1882 32.15 1883 32.16 1884 32.17 1885 32.19 1886 32.2 1887 32.22 1888 32.23 1889 32.24 1890 32.26 1891 32.27 1892 32.29 1893 32.3 1894 32.31 1895 32.33 1896 32.34 1897 32.35 1898 32.37 1899 32.38 1900 32.4 1901 32.41 1902 32.42 1903 32.44 1904 32.45 1905 32.47 1906 32.48 1907 32.49 1908 32.51 1909 32.52 1910 32.54 1911 32.55 1912 32.56 1913 32.58 1914 32.59 1915 32.6 1916 32.62 1917 32.63 1918 27.54 1919 32.66 1920 32.67 1921 32.69 1922 32.7 1923 32.72 1924 32.74 1925 32.75 1926 32.77 1927 32.78 1928 32.81 1929 32.82 1930 32.83 1931 33.32 1932 33.82 1933 34.3 1934 34.8 1935 35.29 1936 35.78 1937 36.28 1938 36.76 1939 37.26 1940 37.75 1941 38.93 1942 40.12 1943 41.31 1944 42.49 1945 43.68 1946 45.3 1947 46.92 1948 48.53 1949 50.15 1950 51.78 1951 52.05 1952 52.57 1953 53.1 1954 53.63 1955 54.16 1956 54.7 1957 55.23 1958 55.77 1959 56.3 1960 56.84 1961 57.36 1962 57.86 1963 58.35 1964 58.83 1965 59.29 1966 59.72 1967 60.15 1968 60.58 1969 60.99 1970 61.43 1971 61.84 1972 62.26 1973 62.73 1974 63.21 1975 63.65 1976 64.12 1977 64.64 1978 65.11 1979 65.54 1980 65.86 1981 66.25 1982 66.43 1983 66.63 1984 66.73 1985 66.99 1986 67.39 1987 67.69 1988 68.03 1989 68.37 1990 68.52 1991 68.85 1992 69.02 1993 69.23 1994 69.47 1995 69.74 1996 70.05 1997 70.42 1998 70.75 1999 71.06 2000 71.44 2001 71.83 2002 72.13 2003 72.39 2004 72.67 2005 72.98 2006 73.25 2007 73.5 2008 73.76 2009 73.98 2010 74.19 2011 74.42 2012 74.66 2013 74.87 2014 75.04 2015 75.17 2016 75.28 2017 75.49 2018 75.7