Year Years
1800 35
1801 35
1802 35
1803 35
1804 35
1805 35
1806 35
1807 35
1808 35
1809 35
1810 35
1811 35
1812 35
1813 35
1814 35
1815 35
1816 35
1817 35
1818 35
1819 35
1820 35
1821 35
1822 35
1823 35
1824 35
1825 35
1826 35
1827 35
1828 35
1829 35
1830 35
1831 35
1832 35
1833 35
1834 35
1835 35
1836 35
1837 35
1838 35
1839 35
1840 35
1841 35
1842 35
1843 35
1844 35
1845 35
1846 35
1847 35
1848 35
1849 35
1850 35
1851 35
1852 35
1853 35
1854 35
1855 35
1856 35
1857 35
1858 35
1859 35
1860 35
1861 35
1862 35
1863 35
1864 35
1865 35
1866 35
1867 35
1868 35
1869 35
1870 35
1871 35.03
1872 35.05
1873 35.08
1874 35.1
1875 35.13
1876 35.15
1877 35.18
1878 35.2
1879 35.23
1880 35.25
1881 35.28
1882 35.3
1883 35.33
1884 35.36
1885 35.38
1886 35.41
1887 35.43
1888 35.46
1889 35.48
1890 35.51
1891 35.53
1892 35.56
1893 35.58
1894 35.61
1895 35.63
1896 35.66
1897 35.69
1898 35.71
1899 35.74
1900 35.76
1901 35.79
1902 35.81
1903 35.84
1904 35.86
1905 35.89
1906 35.91
1907 35.94
1908 35.97
1909 35.99
1910 36.02
1911 36.04
1912 36.07
1913 36.09
1914 36.12
1915 36.14
1916 36.17
1917 36.19
1918 23.21
1919 36.24
1920 36.27
1921 36.3
1922 36.32
1923 36.35
1924 36.37
1925 36.4
1926 36.42
1927 36.45
1928 36.47
1929 36.5
1930 36.52
1931 36.55
1932 36.57
1933 36.6
1934 36.63
1935 36.65
1936 36.68
1937 36.7
1938 36.73
1939 36.75
1940 35.73
1941 35.33
1942 35.25
1943 35.17
1944 33.19
1945 29.52
1946 36.93
1947 38.21
1948 39.51
1949 40.79
1950 42.09
1951 42.26
1952 42.55
1953 42.81
1954 43.03
1955 43.22
1956 43.39
1957 43.52
1958 43.64
1959 43.77
1960 43.9
1961 44.07
1962 44.28
1963 44.52
1964 44.76
1965 45
1966 45.28
1967 45.53
1968 45.65
1969 45.51
1970 44.68
1971 44.95
1972 45.2
1973 45.21
1974 45.2
1975 24.75
1976 24.68
1977 24.47
1978 24.23
1979 23.98
1980 52.54
1981 52.83
1982 53.14
1983 53.47
1984 53.82
1985 54.15
1986 54.48
1987 56.34
1988 56.93
1989 56.98
1990 57.37
1991 57.72
1992 58.06
1993 58.11
1994 58.01
1995 58.16
1996 58.32
1997 58.57
1998 58.84
1999 59.17
2000 59.47
2001 60.07
2002 60.67
2003 61.33
2004 62.04
2005 62.88
2006 63.75
2007 64.5
2008 65.17
2009 65.69
2010 66.12
2011 66.61
2012 67.17
2013 67.58
2014 67.96
2015 68.32
2016 68.66
2017 69.01
2018 69.35