Year Years
1800 34.7
1801 34.7
1802 34.7
1803 34.7
1804 34.7
1805 34.7
1806 34.7
1807 34.7
1808 34.7
1809 34.7
1810 34.7
1811 34.7
1812 34.7
1813 34.7
1814 34.7
1815 34.7
1816 34.7
1817 34.7
1818 34.7
1819 34.7
1820 34.7
1821 34.7
1822 34.7
1823 34.7
1824 34.7
1825 34.7
1826 34.7
1827 34.7
1828 34.7
1829 34.7
1830 34.7
1831 34.7
1832 34.7
1833 34.7
1834 34.7
1835 34.7
1836 34.7
1837 34.7
1838 34.7
1839 34.7
1840 34.7
1841 34.7
1842 34.7
1843 34.7
1844 34.7
1845 34.7
1846 34.7
1847 34.7
1848 34.7
1849 34.7
1850 34.7
1851 34.7
1852 34.7
1853 34.7
1854 34.7
1855 34.7
1856 34.7
1857 34.7
1858 34.7
1859 34.7
1860 34.7
1861 34.7
1862 34.7
1863 34.7
1864 34.7
1865 34.7
1866 34.7
1867 34.7
1868 34.7
1869 34.7
1870 34.7
1871 34.7
1872 34.7
1873 34.71
1874 34.71
1875 34.71
1876 34.71
1877 34.71
1878 34.71
1879 34.72
1880 34.72
1881 34.72
1882 34.72
1883 34.72
1884 34.73
1885 34.73
1886 34.73
1887 34.73
1888 34.73
1889 34.74
1890 34.74
1891 34.74
1892 34.74
1893 34.74
1894 34.74
1895 34.75
1896 34.75
1897 34.75
1898 34.75
1899 34.75
1900 34.76
1901 34.76
1902 34.76
1903 34.76
1904 34.76
1905 34.77
1906 34.77
1907 34.77
1908 34.77
1909 34.77
1910 34.77
1911 34.78
1912 34.78
1913 34.78
1914 34.78
1915 34.78
1916 34.79
1917 34.79
1918 22.3
1919 34.79
1920 34.79
1921 35.64
1922 36.49
1923 37.34
1924 38.18
1925 39.03
1926 39.88
1927 40.72
1928 41.57
1929 42.42
1930 43.27
1931 44.11
1932 44.96
1933 45.81
1934 46.66
1935 47.51
1936 48.36
1937 49.21
1938 50.05
1939 50.91
1940 51.75
1941 52.6
1942 53.45
1943 54.3
1944 55.15
1945 55.99
1946 56.85
1947 57.7
1948 58.54
1949 59.39
1950 60.25
1951 60.51
1952 61.06
1953 61.59
1954 62.12
1955 62.66
1956 63.18
1957 63.71
1958 64.22
1959 64.74
1960 65.24
1961 65.74
1962 66.23
1963 66.69
1964 67.15
1965 67.58
1966 68.01
1967 68.41
1968 68.81
1969 69.2
1970 69.57
1971 69.94
1972 70.28
1973 70.57
1974 70.87
1975 71.22
1976 71.57
1977 71.88
1978 72.24
1979 72.29
1980 72.5
1981 72.62
1982 73.15
1983 73.62
1984 73.98
1985 74.42
1986 74.65
1987 74.97
1988 75.17
1989 75.35
1990 75.87
1991 76.36
1992 76.75
1993 77.16
1994 77.6
1995 78.03
1996 78.4
1997 78.68
1998 78.95
1999 79.18
2000 79.43
2001 78.98
2002 79.63
2003 80.06
2004 80.39
2005 80.55
2006 80.83
2007 81.1
2008 81.27
2009 81.37
2010 81.55
2011 81.93
2012 82.25
2013 82.4
2014 82.45
2015 82.69
2016 82.96
2017 83.1
2018 83.24