Year Years
1800 32.8
1801 32.8
1802 32.8
1803 32.8
1804 32.8
1805 32.8
1806 32.8
1807 32.8
1808 32.8
1809 32.8
1810 32.8
1811 32.8
1812 32.8
1813 32.8
1814 32.8
1815 32.8
1816 32.8
1817 32.8
1818 32.8
1819 32.8
1820 32.8
1821 32.8
1822 32.8
1823 32.8
1824 32.8
1825 32.8
1826 32.8
1827 32.8
1828 32.8
1829 32.8
1830 32.8
1831 32.8
1832 32.8
1833 32.8
1834 32.8
1835 32.8
1836 32.8
1837 32.8
1838 32.8
1839 32.8
1840 32.8
1841 32.8
1842 32.8
1843 32.8
1844 32.8
1845 32.8
1846 32.8
1847 32.8
1848 32.8
1849 32.8
1850 32.8
1851 32.8
1852 32.8
1853 32.8
1854 32.8
1855 32.8
1856 32.8
1857 32.8
1858 32.8
1859 32.8
1860 32.8
1861 32.8
1862 32.8
1863 32.8
1864 32.8
1865 32.8
1866 32.8
1867 32.8
1868 32.8
1869 32.8
1870 32.8
1871 32.85
1872 32.9
1873 32.95
1874 33
1875 33.05
1876 33.1
1877 33.15
1878 33.21
1879 33.26
1880 33.31
1881 33.36
1882 33.41
1883 33.46
1884 33.51
1885 33.56
1886 33.61
1887 33.66
1888 33.71
1889 33.76
1890 33.81
1891 33.86
1892 33.91
1893 33.97
1894 34.02
1895 34.07
1896 34.12
1897 34.17
1898 34.22
1899 34.27
1900 34.32
1901 34.37
1902 34.42
1903 34.47
1904 34.52
1905 34.57
1906 34.62
1907 34.67
1908 34.73
1909 34.78
1910 34.83
1911 34.88
1912 34.93
1913 34.98
1914 35.03
1915 35.08
1916 35.13
1917 35.18
1918 22.58
1919 35.28
1920 35.33
1921 35.38
1922 35.43
1923 35.48
1924 35.54
1925 35.59
1926 35.64
1927 35.69
1928 35.74
1929 35.79
1930 35.84
1931 35.89
1932 35.94
1933 35.99
1934 36.04
1935 36.09
1936 36.14
1937 36.19
1938 36.24
1939 36.3
1940 36.35
1941 36.4
1942 36.45
1943 36.5
1944 36.55
1945 36.6
1946 37.05
1947 37.51
1948 37.96
1949 38.41
1950 38.86
1951 39.15
1952 39.66
1953 40.17
1954 40.69
1955 41.21
1956 41.72
1957 42.24
1958 42.77
1959 43.28
1960 43.81
1961 44.32
1962 44.85
1963 45.37
1964 45.89
1965 46.41
1966 46.92
1967 47.43
1968 47.94
1969 48.46
1970 48.98
1971 49.35
1972 49.65
1973 49.94
1974 50.27
1975 50.57
1976 50.89
1977 51.27
1978 51.64
1979 52.09
1980 52.44
1981 52.8
1982 53.36
1983 53.79
1984 54.3
1985 54.88
1986 55.45
1987 55.97
1988 56.46
1989 57.16
1990 57.7
1991 58.25
1992 59.08
1993 59.28
1994 60.01
1995 60.58
1996 61.32
1997 62.05
1998 62.55
1999 63.16
2000 63.7
2001 64.31
2002 64.39
2003 65.24
2004 65.56
2005 66.02
2006 66.48
2007 66.91
2008 67.33
2009 67.79
2010 68.26
2011 68.72
2012 69.2
2013 69.63
2014 70.01
2015 69.66
2016 70.82
2017 71.17
2018 71.51