Year Years 1800 27.66 1801 27.66 1802 27.66 1803 27.66 1804 27.66 1805 27.66 1806 27.66 1807 27.66 1808 27.66 1809 27.66 1810 27.66 1811 27.66 1812 27.66 1813 27.66 1814 27.66 1815 27.66 1816 27.66 1817 27.66 1818 27.66 1819 27.66 1820 27.66 1821 27.66 1822 27.66 1823 27.66 1824 27.66 1825 27.66 1826 27.66 1827 27.66 1828 27.66 1829 27.66 1830 27.66 1831 27.66 1832 27.66 1833 27.66 1834 27.66 1835 27.66 1836 27.66 1837 27.66 1838 27.66 1839 27.66 1840 27.66 1841 27.66 1842 27.66 1843 27.66 1844 27.66 1845 27.66 1846 27.66 1847 27.66 1848 27.66 1849 27.66 1850 27.66 1851 27.66 1852 27.66 1853 27.66 1854 27.66 1855 27.66 1856 27.66 1857 27.66 1858 27.66 1859 27.66 1860 27.66 1861 27.66 1862 27.66 1863 27.66 1864 27.66 1865 27.66 1866 27.66 1867 27.66 1868 27.66 1869 27.66 1870 27.66 1871 27.66 1872 27.66 1873 27.66 1874 27.66 1875 27.66 1876 27.66 1877 27.66 1878 27.66 1879 27.66 1880 27.66 1881 27.66 1882 27.66 1883 27.66 1884 27.66 1885 27.66 1886 27.66 1887 27.66 1888 27.66 1889 27.66 1890 27.66 1891 27.66 1892 27.66 1893 27.66 1894 27.66 1895 27.66 1896 27.66 1897 27.66 1898 27.66 1899 27.66 1900 27.66 1901 27.66 1902 27.66 1903 27.66 1904 27.66 1905 27.66 1906 27.66 1907 27.66 1908 27.66 1909 27.66 1910 27.66 1911 27.66 1912 27.66 1913 27.66 1914 27.66 1915 27.66 1916 27.66 1917 27.66 1918 17.94 1919 27.66 1920 27.66 1921 27.66 1922 28.48 1923 29.31 1924 30.14 1925 30.97 1926 31.79 1927 32.62 1928 33.45 1929 34.28 1930 35.1 1931 35.93 1932 36.76 1933 37.59 1934 38.41 1935 39.24 1936 40.07 1937 40.9 1938 41.72 1939 42.55 1940 43.38 1941 44.21 1942 45.03 1943 45.86 1944 46.69 1945 47.52 1946 48.34 1947 49.17 1948 50 1949 50.83 1950 51.66 1951 52.09 1952 52.94 1953 53.77 1954 54.57 1955 55.35 1956 56.11 1957 56.84 1958 57.55 1959 58.24 1960 58.91 1961 59.58 1962 60.23 1963 60.87 1964 61.51 1965 62.14 1966 62.75 1967 63.34 1968 63.91 1969 64.46 1970 64.98 1971 65.49 1972 65.99 1973 66.49 1974 66.97 1975 67.46 1976 67.93 1977 68.4 1978 68.86 1979 69.31 1980 69.75 1981 70.18 1982 70.6 1983 71.01 1984 71.42 1985 71.82 1986 72.21 1987 72.6 1988 72.98 1989 73.35 1990 73.72 1991 74.08 1992 74.44 1993 74.79 1994 75.14 1995 75.48 1996 75.82 1997 76.15 1998 76.48 1999 76.8 2000 77.12 2001 77.43 2002 77.74 2003 78.04 2004 78.35 2005 78.65 2006 78.95 2007 79.25 2008 79.55 2009 79.85 2010 80.14 2011 80.43 2012 80.69 2013 80.95 2014 81.18 2015 81.41 2016 81.64 2017 81.87 2018 82.09