Year Years
1800 34
1801 34
1802 34
1803 34
1804 34
1805 34
1806 34
1807 34
1808 34
1809 34
1810 34
1811 34
1812 34
1813 34
1814 34
1815 34
1816 34
1817 34
1818 34
1819 34
1820 34
1821 34
1822 34
1823 34
1824 34
1825 34
1826 34
1827 34
1828 34
1829 34
1830 34
1831 34
1832 34
1833 34
1834 34
1835 34
1836 34
1837 34
1838 34
1839 34
1840 34
1841 34
1842 34
1843 34
1844 34
1845 34
1846 34
1847 34
1848 34
1849 34
1850 34
1851 34
1852 34
1853 34
1854 34
1855 34
1856 34
1857 34
1858 34
1859 34
1860 34
1861 34
1862 34
1863 34
1864 33.47
1865 32.95
1866 32.42
1867 31.9
1868 31.38
1869 31.42
1870 31.46
1871 31.49
1872 31.51
1873 31.54
1874 31.72
1875 31.89
1876 32.07
1877 32.25
1878 32.43
1879 32.6
1880 32.78
1881 32.96
1882 33.13
1883 33.31
1884 33.48
1885 33.66
1886 33.83
1887 34.01
1888 34.18
1889 34.36
1890 34.53
1891 34.71
1892 34.88
1893 35.05
1894 35.23
1895 35.4
1896 35.57
1897 35.74
1898 35.55
1899 35.36
1900 35.18
1901 35.4
1902 35.62
1903 35.84
1904 36.06
1905 36.28
1906 36.5
1907 36.72
1908 36.94
1909 37.16
1910 37.38
1911 40.22
1912 40.61
1913 38.47
1914 38.05
1915 37.64
1916 37.61
1917 34.68
1918 26.14
1919 35.79
1920 27.07
1921 36.71
1922 37.65
1923 38.46
1924 40.84
1925 39.95
1926 43
1927 42.33
1928 43.75
1929 42.53
1930 41.84
1931 40.29
1932 37.87
1933 31.61
1934 43.99
1935 45.44
1936 47
1937 46.03
1938 47.61
1939 49.86
1940 47.47
1941 26.67
1942 23.32
1943 21.4
1944 28.52
1945 37.52
1946 53.92
1947 46.29
1948 53.91
1949 56.52
1950 58.66
1951 58.82
1952 59.18
1953 59.53
1954 59.89
1955 60.25
1956 60.6
1957 60.94
1958 61.3
1959 61.66
1960 62.01
1961 62.37
1962 62.74
1963 63.11
1964 63.46
1965 63.83
1966 64.2
1967 64.55
1968 64.89
1969 65.2
1970 65.46
1971 66.05
1972 66.55
1973 67.07
1974 67.56
1975 67.98
1976 68.44
1977 68.83
1978 69.15
1979 69.4
1980 69.63
1981 69.94
1982 70.36
1983 70.31
1984 70.64
1985 70.69
1986 71.19
1987 71.37
1988 55
1989 70.62
1990 70.24
1991 70
1992 69.05
1993 68.66
1994 68.87
1995 69.26
1996 69.55
1997 70.25
1998 70.74
1999 71.17
2000 71.85
2001 72.07
2002 72.46
2003 72.55
2004 72.66
2005 72.5
2006 72.45
2007 72.88
2008 72.81
2009 73.01
2010 73.34
2011 73.8
2012 74.29
2013 74.99
2014 75.36
2015 75.38
2016 75.65
2017 75.81
2018 75.97