Year Years
1800 32.9
1801 32.9
1802 32.9
1803 32.9
1804 32.9
1805 32.9
1806 32.9
1807 32.9
1808 32.9
1809 32.9
1810 32.9
1811 32.9
1812 32.9
1813 32.9
1814 32.9
1815 32.9
1816 32.9
1817 32.9
1818 32.9
1819 32.9
1820 32.9
1821 32.9
1822 32.9
1823 32.9
1824 32.9
1825 32.9
1826 32.9
1827 32.9
1828 32.9
1829 32.9
1830 32.9
1831 32.9
1832 32.9
1833 32.9
1834 32.9
1835 32.9
1836 32.9
1837 32.9
1838 32.9
1839 32.9
1840 32.9
1841 32.9
1842 32.9
1843 32.9
1844 32.9
1845 32.9
1846 32.9
1847 32.9
1848 32.9
1849 32.9
1850 32.9
1851 32.9
1852 32.9
1853 32.9
1854 32.9
1855 32.9
1856 32.9
1857 32.9
1858 32.9
1859 32.9
1860 32.9
1861 32.9
1862 32.9
1863 32.9
1864 32.9
1865 32.9
1866 32.9
1867 32.9
1868 32.9
1869 32.9
1870 32.9
1871 32.9
1872 32.9
1873 32.9
1874 32.9
1875 32.9
1876 32.9
1877 32.9
1878 32.9
1879 32.9
1880 32.9
1881 32.9
1882 32.9
1883 32.9
1884 32.9
1885 32.9
1886 32.9
1887 32.9
1888 32.9
1889 32.9
1890 32.89
1891 32.89
1892 32.89
1893 32.89
1894 32.89
1895 32.89
1896 32.89
1897 32.89
1898 32.89
1899 32.89
1900 32.89
1901 32.89
1902 32.89
1903 32.89
1904 32.89
1905 32.89
1906 32.89
1907 32.89
1908 32.89
1909 32.89
1910 32.89
1911 32.89
1912 32.89
1913 32.89
1914 32.89
1915 32.89
1916 32.89
1917 32.89
1918 30.59
1919 32.89
1920 32.89
1921 32.89
1922 32.89
1923 32.89
1924 32.89
1925 32.89
1926 34.2
1927 35.51
1928 36.83
1929 38.14
1930 39.46
1931 40.78
1932 42.09
1933 43.41
1934 44.73
1935 46.04
1936 47.36
1937 48.66
1938 49.98
1939 51.3
1940 52.61
1941 53.93
1942 55.24
1943 56.56
1944 57.88
1945 59.18
1946 60.5
1947 61.82
1948 63.13
1949 64.45
1950 65.76
1951 65.83
1952 65.97
1953 66.13
1954 66.31
1955 66.51
1956 66.74
1957 66.98
1958 67.23
1959 67.49
1960 67.73
1961 67.96
1962 68.15
1963 68.3
1964 68.41
1965 68.47
1966 68.51
1967 68.52
1968 68.53
1969 68.54
1970 68.57
1971 68.66
1972 68.48
1973 68.55
1974 68.6
1975 68.79
1976 69
1977 69.08
1978 69.58
1979 69.89
1980 70.21
1981 70.82
1982 71.34
1983 71.53
1984 71.51
1985 71.64
1986 71.87
1987 72.14
1988 72.41
1989 72.68
1990 72.8
1991 72.92
1992 73.11
1993 73.18
1994 73.46
1995 73.51
1996 73.7
1997 73.93
1998 74.18
1999 74.42
2000 74.82
2001 74.93
2002 75.04
2003 75.01
2004 75.27
2005 75.59
2006 75.8
2007 75.81
2008 76.1
2009 76.33
2010 76.36
2011 76.43
2012 76.52
2013 76.73
2014 77
2015 77.14
2016 77.26
2017 77.42
2018 77.57