Year Years
1800 35.18
1801 35.18
1802 35.18
1803 35.18
1804 35.18
1805 35.18
1806 35.18
1807 35.18
1808 35.18
1809 35.18
1810 35.18
1811 35.18
1812 35.18
1813 35.18
1814 35.18
1815 35.18
1816 35.18
1817 35.18
1818 35.18
1819 35.18
1820 35.18
1821 35.18
1822 35.18
1823 35.18
1824 35.18
1825 35.18
1826 35.18
1827 35.18
1828 35.18
1829 35.18
1830 35.18
1831 35.18
1832 35.18
1833 35.18
1834 35.18
1835 35.18
1836 35.18
1837 35.18
1838 35.18
1839 35.18
1840 35.18
1841 35.18
1842 35.18
1843 35.18
1844 35.18
1845 35.18
1846 35.18
1847 35.18
1848 35.18
1849 35.18
1850 35.18
1851 35.18
1852 35.18
1853 35.18
1854 35.18
1855 35.18
1856 35.18
1857 35.18
1858 35.18
1859 35.18
1860 35.18
1861 35.18
1862 35.18
1863 35.18
1864 35.18
1865 35.18
1866 35.18
1867 35.18
1868 35.18
1869 35.18
1870 35.18
1871 35.17
1872 35.17
1873 35.16
1874 35.16
1875 35.15
1876 35.14
1877 35.14
1878 35.13
1879 35.13
1880 35.12
1881 35.11
1882 35.11
1883 35.1
1884 35.1
1885 35.09
1886 35.08
1887 35.08
1888 35.07
1889 35.07
1890 35.06
1891 35.05
1892 35.05
1893 35.04
1894 35.04
1895 35.03
1896 35.02
1897 35.02
1898 35.01
1899 35.01
1900 35
1901 34.99
1902 34.99
1903 34.98
1904 34.98
1905 34.97
1906 34.97
1907 34.96
1908 34.95
1909 34.95
1910 34.94
1911 34.94
1912 34.93
1913 34.92
1914 34.92
1915 34.91
1916 34.91
1917 34.9
1918 22.63
1919 34.89
1920 34.88
1921 34.88
1922 35.69
1923 36.5
1924 37.31
1925 38.13
1926 38.95
1927 39.75
1928 40.57
1929 41.38
1930 42.2
1931 43
1932 43.81
1933 44.63
1934 45.44
1935 46.25
1936 47.06
1937 47.87
1938 48.68
1939 49.49
1940 50.3
1941 51.11
1942 51.92
1943 52.73
1944 53.53
1945 54.34
1946 55.15
1947 55.96
1948 56.76
1949 57.57
1950 58.38
1951 58.58
1952 58.99
1953 59.39
1954 59.79
1955 60.17
1956 60.53
1957 60.9
1958 61.25
1959 61.59
1960 61.92
1961 62.24
1962 62.56
1963 62.86
1964 63.17
1965 63.46
1966 63.74
1967 64.03
1968 64.29
1969 64.57
1970 64.82
1971 65.29
1972 65.69
1973 66.28
1974 66.67
1975 66.75
1976 67.11
1977 67.35
1978 67.56
1979 67.8
1980 68.05
1981 68.29
1982 68.58
1983 68.91
1984 69.22
1985 69.18
1986 69.34
1987 69.59
1988 69.95
1989 70.27
1990 70.54
1991 70.8
1992 70.77
1993 70.88
1994 70.64
1995 70.57
1996 70.71
1997 70.82
1998 70.96
1999 71.1
2000 71.28
2001 71.47
2002 71.64
2003 72.16
2004 72.74
2005 72.98
2006 73.32
2007 73.63
2008 73.71
2009 73.79
2010 73.79
2011 73.76
2012 73.69
2013 73.7
2014 73.77
2015 73.63
2016 73.81
2017 73.96
2018 74.1