Year Years
1800 36.2
1801 36.2
1802 36.2
1803 36.2
1804 36.2
1805 36.2
1806 36.2
1807 36.2
1808 36.2
1809 36.2
1810 36.2
1811 36.2
1812 36.2
1813 36.2
1814 36.2
1815 36.2
1816 36.2
1817 36.2
1818 36.2
1819 36.2
1820 36.2
1821 36.2
1822 36.2
1823 36.2
1824 36.2
1825 36.2
1826 36.2
1827 36.2
1828 36.2
1829 36.2
1830 36.2
1831 36.2
1832 36.2
1833 36.2
1834 36.2
1835 36.2
1836 36.2
1837 36.2
1838 36.2
1839 36.2
1840 36.2
1841 36.2
1842 36.2
1843 36.2
1844 36.2
1845 36.2
1846 36.2
1847 36.2
1848 36.2
1849 36.2
1850 36.2
1851 36.2
1852 36.2
1853 36.2
1854 36.2
1855 36.2
1856 36.2
1857 36.2
1858 36.2
1859 36.2
1860 36.2
1861 36.2
1862 36.2
1863 36.2
1864 36.2
1865 36.2
1866 36.2
1867 36.2
1868 36.2
1869 36.2
1870 36.2
1871 36.19
1872 36.19
1873 36.18
1874 36.17
1875 36.16
1876 36.16
1877 36.15
1878 36.14
1879 36.14
1880 36.13
1881 36.12
1882 36.11
1883 36.11
1884 36.1
1885 36.09
1886 36.09
1887 36.08
1888 36.07
1889 36.06
1890 36.06
1891 36.05
1892 36.04
1893 36.04
1894 36.03
1895 36.02
1896 36.01
1897 36.01
1898 36
1899 35.99
1900 35.99
1901 36.59
1902 37.18
1903 37.78
1904 38.39
1905 38.99
1906 39.59
1907 40.18
1908 40.78
1909 41.38
1910 41.98
1911 42.57
1912 43.18
1913 43.78
1914 42.55
1915 37.04
1916 37.03
1917 35.04
1918 31.07
1919 33.05
1920 30.12
1921 33.38
1922 34.27
1923 43.07
1924 45.53
1925 44.63
1926 47.79
1927 46.89
1928 48.46
1929 46.57
1930 46.51
1931 47.49
1932 38.84
1933 25.68
1934 41.59
1935 51.3
1936 51.98
1937 50.74
1938 51.96
1939 51.76
1940 51.55
1941 19.72
1942 14.79
1943 13.8
1944 20.69
1945 29.56
1946 56.81
1947 46.9
1948 59.34
1949 62.09
1950 63.99
1951 64.21
1952 64.63
1953 65.05
1954 65.45
1955 65.84
1956 66.22
1957 66.58
1958 66.93
1959 67.85
1960 70.58
1961 71.27
1962 70
1963 70.63
1964 72.12
1965 71.65
1966 71.99
1967 71.73
1968 71.83
1969 71.42
1970 70.89
1971 71.12
1972 71.13
1973 71.28
1974 71.41
1975 71.16
1976 71.02
1977 70.94
1978 70.83
1979 70.59
1980 70.45
1981 70.5
1982 70.48
1983 70.4
1984 70.13
1985 70.46
1986 71.37
1987 71.46
1988 71.39
1989 70.99
1990 70.56
1991 70.15
1992 69.68
1993 68.95
1994 68.64
1995 68.29
1996 68.33
1997 68.24
1998 68.19
1999 68.09
2000 68.46
2001 68.32
2002 68.14
2003 68.47
2004 68.73
2005 68.88
2006 69.36
2007 69.93
2008 70.18
2009 70.29
2010 70.43
2011 70.69
2012 71.83
2013 72.41
2014 73.02
2015 73.29
2016 73.47
2017 73.62
2018 73.76