Year Years
1800 36
1801 36
1802 36
1803 36
1804 36
1805 36
1806 36
1807 36
1808 36
1809 36
1810 36
1811 36
1812 36
1813 36
1814 36
1815 36
1816 36
1817 36
1818 36
1819 36
1820 36
1821 36
1822 36
1823 36
1824 36
1825 36
1826 36
1827 36
1828 36
1829 36
1830 36
1831 36
1832 36
1833 36
1834 36
1835 36
1836 36
1837 36
1838 36
1839 36
1840 36
1841 36
1842 36
1843 36
1844 36
1845 36
1846 36
1847 36
1848 36
1849 36
1850 36
1851 36
1852 36
1853 36
1854 36
1855 36
1856 36
1857 36
1858 36
1859 36
1860 36
1861 36
1862 36
1863 36
1864 36
1865 36
1866 36
1867 36
1868 36
1869 36
1870 36
1871 36
1872 36
1873 36
1874 36
1875 36
1876 36
1877 36
1878 36
1879 36
1880 36
1881 35.99
1882 35.99
1883 35.99
1884 35.99
1885 35.99
1886 35.99
1887 35.99
1888 35.99
1889 35.99
1890 35.99
1891 36.12
1892 36.26
1893 36.39
1894 36.52
1895 36.66
1896 36.79
1897 36.93
1898 37.06
1899 37.19
1900 37.33
1901 37.57
1902 37.8
1903 38.04
1904 38.28
1905 38.53
1906 38.77
1907 39.01
1908 39.25
1909 39.5
1910 39.74
1911 39.97
1912 40.2
1913 40.43
1914 40.66
1915 40.89
1916 41.12
1917 41.34
1918 30.09
1919 41.8
1920 42.03
1921 42.84
1922 43.66
1923 44.47
1924 45.29
1925 46.1
1926 46.92
1927 47.73
1928 48.54
1929 49.36
1930 50.17
1931 50.85
1932 51.53
1933 52.21
1934 52.89
1935 53.57
1936 54.24
1937 54.91
1938 55.59
1939 56.27
1940 56.95
1941 56.51
1942 50.95
1943 40.96
1944 25.98
1945 46.95
1946 54.95
1947 58.94
1948 60.64
1949 61.23
1950 62.01
1951 62.39
1952 63.96
1953 63.8
1954 65.36
1955 66.81
1956 65.97
1957 66.34
1958 67.34
1959 67.24
1960 68.01
1961 68.94
1962 67.88
1963 68.9
1964 69.4
1965 69.09
1966 69.84
1967 69.41
1968 69.24
1969 69.31
1970 69.15
1971 69.27
1972 69.47
1973 69.5
1974 69.33
1975 69.41
1976 69.63
1977 69.75
1978 69.64
1979 69.49
1980 69.31
1981 69.25
1982 69.16
1983 69.14
1984 69.12
1985 69.14
1986 69.31
1987 69.53
1988 69.68
1989 69.65
1990 69.57
1991 69.38
1992 69.41
1993 69.53
1994 69.81
1995 70.16
1996 70.46
1997 70.82
1998 71.14
1999 71.46
2000 71.8
2001 72.2
2002 72.5
2003 72.69
2004 72.9
2005 73.09
2006 73.33
2007 73.58
2008 73.87
2009 74.19
2010 74.52
2011 74.89
2012 75.2
2013 75.46
2014 75.59
2015 75.65
2016 75.66
2017 75.78
2018 75.9