Year Years 1800 28.21 1801 28.2 1802 28.19 1803 28.18 1804 28.17 1805 28.16 1806 28.15 1807 28.14 1808 28.13 1809 28.12 1810 28.11 1811 28.1 1812 28.09 1813 28.08 1814 28.07 1815 28.06 1816 28.05 1817 28.04 1818 28.03 1819 28.02 1820 28.01 1821 28 1822 27.99 1823 27.98 1824 27.97 1825 27.95 1826 27.94 1827 27.93 1828 27.92 1829 27.91 1830 27.9 1831 27.89 1832 27.88 1833 27.87 1834 27.86 1835 27.85 1836 27.84 1837 27.83 1838 27.82 1839 27.81 1840 27.8 1841 27.79 1842 27.78 1843 27.77 1844 27.76 1845 27.75 1846 27.74 1847 27.73 1848 27.72 1849 27.71 1850 27.7 1851 27.69 1852 27.68 1853 27.67 1854 27.66 1855 27.65 1856 27.64 1857 27.63 1858 27.62 1859 27.61 1860 27.6 1861 27.59 1862 27.58 1863 27.57 1864 27.56 1865 27.54 1866 27.53 1867 27.52 1868 27.51 1869 27.5 1870 27.49 1871 27.55 1872 27.61 1873 27.66 1874 27.72 1875 27.78 1876 27.84 1877 27.9 1878 27.96 1879 28.01 1880 28.07 1881 28.13 1882 28.19 1883 28.24 1884 28.3 1885 28.36 1886 28.42 1887 28.48 1888 28.53 1889 28.59 1890 28.65 1891 28.71 1892 28.76 1893 28.82 1894 28.88 1895 28.93 1896 28.99 1897 29.05 1898 29.11 1899 29.16 1900 29.22 1901 29.28 1902 29.33 1903 29.39 1904 29.45 1905 29.5 1906 29.55 1907 29.61 1908 29.66 1909 29.72 1910 29.77 1911 29.83 1912 29.89 1913 29.94 1914 30 1915 30.06 1916 30.11 1917 30.17 1918 7.89 1919 30.28 1920 30.34 1921 30.39 1922 30.45 1923 30.5 1924 30.56 1925 30.61 1926 30.67 1927 30.73 1928 30.78 1929 30.84 1930 30.89 1931 30.95 1932 31 1933 31.06 1934 31.11 1935 31.17 1936 31.22 1937 31.28 1938 31.33 1939 31.39 1940 31.44 1941 31.5 1942 31.55 1943 31.61 1944 31.66 1945 31.72 1946 31.76 1947 31.81 1948 31.87 1949 31.92 1950 31.98 1951 32.36 1952 33.05 1953 33.73 1954 34.43 1955 35.13 1956 35.82 1957 36.53 1958 37.23 1959 37.94 1960 38.65 1961 39.36 1962 40.07 1963 40.78 1964 41.51 1965 42.22 1966 42.94 1967 43.66 1968 44.37 1969 45.08 1970 45.78 1971 45.89 1972 45.89 1973 45.98 1974 46.09 1975 46.26 1976 46.46 1977 46.6 1978 45.02 1979 43.57 1980 43.26 1981 44.06 1982 43.75 1983 42.02 1984 39.77 1985 41.61 1986 42.58 1987 44.7 1988 46.97 1989 50.78 1990 51.61 1991 51.29 1992 51.42 1993 51.35 1994 50.71 1995 51.07 1996 51.4 1997 51.13 1998 50.12 1999 51.54 2000 51.63 2001 51.69 2002 52.43 2003 53.03 2004 53.5 2005 53.87 2006 54.15 2007 54.57 2008 55.21 2009 55.69 2010 56.2 2011 56.71 2012 57.23 2013 57.71 2014 57.83 2015 57.9 2016 58.02 2017 58.36 2018 58.69