Year Years
1800 32.1
1801 32.1
1802 32.1
1803 32.1
1804 32.1
1805 32.1
1806 32.1
1807 32.1
1808 32.1
1809 32.1
1810 32.1
1811 32.1
1812 32.1
1813 32.1
1814 32.1
1815 32.1
1816 32.1
1817 32.1
1818 32.1
1819 32.1
1820 32.1
1821 32.1
1822 32.1
1823 32.1
1824 32.1
1825 32.1
1826 32.1
1827 32.1
1828 32.1
1829 32.1
1830 32.1
1831 32.1
1832 32.1
1833 32.1
1834 32.1
1835 32.1
1836 32.1
1837 32.1
1838 32.1
1839 32.1
1840 32.1
1841 32.1
1842 32.1
1843 32.1
1844 32.1
1845 32.1
1846 32.1
1847 32.1
1848 32.1
1849 32.1
1850 32.1
1851 32.1
1852 32.1
1853 32.1
1854 32.1
1855 32.1
1856 32.1
1857 32.1
1858 32.1
1859 32.1
1860 32.1
1861 32.1
1862 32.1
1863 32.1
1864 32.1
1865 32.1
1866 32.1
1867 32.1
1868 32.1
1869 32.1
1870 32.1
1871 32.14
1872 32.18
1873 32.22
1874 32.25
1875 32.29
1876 32.33
1877 32.37
1878 32.41
1879 32.45
1880 32.49
1881 32.52
1882 32.56
1883 32.6
1884 32.64
1885 32.68
1886 32.72
1887 32.75
1888 32.79
1889 32.83
1890 32.87
1891 32.91
1892 32.95
1893 32.99
1894 33.02
1895 33.06
1896 33.1
1897 33.14
1898 33.18
1899 33.22
1900 33.26
1901 33.29
1902 33.33
1903 33.37
1904 33.41
1905 33.45
1906 33.49
1907 33.52
1908 33.56
1909 33.6
1910 33.64
1911 33.68
1912 33.72
1913 33.76
1914 33.79
1915 33.83
1916 33.87
1917 33.91
1918 28.14
1919 33.99
1920 34.03
1921 34.06
1922 34.1
1923 34.14
1924 34.18
1925 34.22
1926 34.26
1927 34.3
1928 34.33
1929 34.37
1930 34.41
1931 34.45
1932 34.49
1933 34.53
1934 34.56
1935 34.6
1936 35.65
1937 36.7
1938 37.75
1939 38.81
1940 39.86
1941 40.92
1942 41.98
1943 43.05
1944 44.11
1945 45.18
1946 46.24
1947 47.32
1948 48.39
1949 49.47
1950 50.55
1951 50.7
1952 50.99
1953 51.31
1954 51.66
1955 52.06
1956 52.5
1957 52.98
1958 53.49
1959 54.05
1960 54.66
1961 55.31
1962 56.01
1963 56.73
1964 57.51
1965 58.31
1966 59.12
1967 59.94
1968 60.76
1969 61.6
1970 62.43
1971 66.47
1972 66.86
1973 40.69
1974 67.03
1975 67.08
1976 67.28
1977 67.53
1978 68.05
1979 68.55
1980 69.03
1981 69.37
1982 44.35
1983 70.07
1984 70.4
1985 70.7
1986 70.97
1987 70.78
1988 70.82
1989 70.86
1990 70.96
1991 71.07
1992 71.27
1993 71.49
1994 71.84
1995 72.04
1996 72.09
1997 72.08
1998 72.05
1999 71.92
2000 71.43
2001 71.73
2002 71.39
2003 71.32
2004 71.49
2005 71.88
2006 71.86
2007 71.98
2008 72.1
2009 71.9
2010 72.27
2011 72.14
2012 72.1
2013 72.07
2014 70.66
2015 71.81
2016 71.85
2017 72.02
2018 72.19