Year Years
1800 33.2
1801 33.2
1802 33.2
1803 33.2
1804 33.2
1805 33.2
1806 33.2
1807 33.2
1808 33.2
1809 33.2
1810 33.2
1811 33.2
1812 33.2
1813 33.2
1814 33.2
1815 33.2
1816 33.2
1817 33.2
1818 33.2
1819 33.2
1820 33.2
1821 33.2
1822 33.2
1823 33.2
1824 33.2
1825 33.2
1826 33.2
1827 33.2
1828 33.2
1829 33.2
1830 33.2
1831 33.2
1832 33.2
1833 33.2
1834 33.2
1835 33.2
1836 33.2
1837 33.2
1838 33.2
1839 33.2
1840 33.2
1841 33.2
1842 33.2
1843 33.2
1844 33.2
1845 33.2
1846 33.2
1847 33.2
1848 33.2
1849 33.2
1850 33.2
1851 33.2
1852 33.2
1853 33.2
1854 33.2
1855 33.2
1856 33.2
1857 33.2
1858 33.2
1859 33.2
1860 33.2
1861 33.2
1862 33.2
1863 33.2
1864 33.2
1865 33.2
1866 33.2
1867 33.2
1868 33.2
1869 33.2
1870 33.2
1871 33.19
1872 33.19
1873 33.18
1874 33.18
1875 33.17
1876 33.15
1877 33.12
1878 33.1
1879 33.07
1880 33.05
1881 32.94
1882 32.84
1883 32.73
1884 32.63
1885 32.52
1886 32.79
1887 33.07
1888 33.34
1889 33.62
1890 33.89
1891 33.74
1892 33.6
1893 33.45
1894 33.31
1895 33.16
1896 33.86
1897 34.55
1898 35.24
1899 35.93
1900 36.62
1901 37.19
1902 37.76
1903 38.33
1904 38.9
1905 39.47
1906 40.22
1907 40.97
1908 41.72
1909 42.47
1910 43.21
1911 43.74
1912 44.27
1913 44.8
1914 45.33
1915 45.86
1916 46.65
1917 47.43
1918 41.43
1919 49
1920 49.79
1921 50.26
1922 50.72
1923 51.19
1924 51.66
1925 52.13
1926 52.45
1927 52.78
1928 53.11
1929 53.44
1930 53.77
1931 53.76
1932 53.75
1933 53.74
1934 53.73
1935 53.72
1936 54.66
1937 55.6
1938 56.54
1939 57.48
1940 58.42
1941 58.99
1942 59.55
1943 60.11
1944 60.68
1945 61.24
1946 61.11
1947 60.99
1948 60.86
1949 60.73
1950 60.62
1951 60.91
1952 61.48
1953 62.01
1954 62.46
1955 62.86
1956 63.21
1957 63.49
1958 63.74
1959 63.92
1960 64.06
1961 64.17
1962 64.25
1963 64.32
1964 64.38
1965 64.46
1966 64.57
1967 64.72
1968 64.89
1969 65.11
1970 65.36
1971 65.65
1972 65.99
1973 66.43
1974 66.79
1975 67.35
1976 67.76
1977 68.2
1978 68.84
1979 69.38
1980 69.85
1981 70.16
1982 70.55
1983 70.62
1984 70.93
1985 71.33
1986 71.6
1987 71.77
1988 71.91
1989 72.05
1990 72.14
1991 72.34
1992 72.5
1993 72.74
1994 73
1995 73.12
1996 73.3
1997 73.5
1998 73.71
1999 73.93
2000 74.21
2001 74.38
2002 74.48
2003 74.63
2004 74.9
2005 75.15
2006 75.29
2007 75.32
2008 75.52
2009 75.66
2010 75.82
2011 75.98
2012 76.1
2013 76.22
2014 76.42
2015 76.54
2016 76.65
2017 76.81
2018 76.97