Year Years 1800 42.85 1801 33.88 1802 27.62 1803 19.6 1804 24.76 1805 30.85 1806 45.82 1807 43.56 1808 43.55 1809 40.42 1810 43.14 1811 38.56 1812 33.73 1813 33.3 1814 37.17 1815 45.15 1816 31.12 1817 45.65 1818 43.48 1819 36.82 1820 36.56 1821 31.01 1822 48.39 1823 45.89 1824 41.6 1825 32.79 1826 25.63 1827 24.92 1828 29.6 1829 34.9 1830 40.5 1831 40.47 1832 39.07 1833 35.94 1834 24.01 1835 36.63 1836 30.86 1837 32.81 1838 32.4 1839 27.95 1840 31.97 1841 40.22 1842 40.13 1843 25.39 1844 42.9 1845 41.35 1846 18.31 1847 32.94 1848 41.39 1849 37.14 1850 36.61 1851 30.01 1852 42.1 1853 48.6 1854 43.14 1855 38.15 1856 42.34 1857 39.49 1858 34.84 1859 29.67 1860 19.76 1861 27.09 1862 26.96 1863 35.11 1864 34.81 1865 34.21 1866 27.2 1867 37.54 1868 34.64 1869 28.03 1870 38.37 1871 35.02 1872 25.15 1873 36.61 1874 39.62 1875 36.54 1876 40.25 1877 44.65 1878 41.62 1879 39.53 1880 42.33 1881 35.83 1882 17.74 1883 30.28 1884 42.2 1885 45.47 1886 44.98 1887 40.61 1888 46.81 1889 52.49 1890 36.59 1891 47.51 1892 52.75 1893 52.6 1894 44.81 1895 52.54 1896 53.24 1897 48.54 1898 44.22 1899 49.82 1900 46.66 1901 53.01 1902 50.55 1903 48.87 1904 52.69 1905 49.54 1906 53.61 1907 49.77 1908 45.82 1909 52.4 1910 52.71 1911 55.51 1912 56.04 1913 58.99 1914 51.96 1915 53.7 1916 54.57 1917 59.07 1918 51.11 1919 58.54 1920 54.63 1921 54.26 1922 57 1923 57.72 1924 54.05 1925 58.29 1926 60.85 1927 58.18 1928 61.87 1929 60.61 1930 60.29 1931 60.9 1932 62.23 1933 63.09 1934 63.44 1935 59.56 1936 62.82 1937 63.59 1938 65.17 1939 66.07 1940 65.87 1941 63.26 1942 64.2 1943 65.3 1944 66.89 1945 67.62 1946 68.65 1947 69.48 1948 70.27 1949 71.54 1950 71.11 1951 71.15 1952 72.59 1953 72.42 1954 73.47 1955 73.41 1956 73.09 1957 73.58 1958 73.54 1959 72.77 1960 74.21 1961 73.59 1962 73.8 1963 73.1 1964 73.69 1965 73.96 1966 73.35 1967 73.86 1968 74.07 1969 73.84 1970 73.94 1971 74.03 1972 74.22 1973 74.54 1974 74.68 1975 75.2 1976 75.67 1977 76 1978 76.3 1979 76.53 1980 76.74 1981 76.93 1982 76.98 1983 77.05 1984 77.28 1985 77.39 1986 77.43 1987 77.54 1988 77.73 1989 77.9 1990 78.04 1991 78.21 1992 78.48 1993 78.64 1994 78.71 1995 78.49 1996 79 1997 79.17 1998 79.42 1999 79.63 2000 79.88 2001 80.18 2002 80.46 2003 80.72 2004 80.95 2005 81.18 2006 81.35 2007 81.58 2008 81.78 2009 81.91 2010 82.03 2011 82.14 2012 82.22 2013 82.25 2014 82.23 2015 82.24 2016 82.28 2017 82.44 2018 82.6