Year Years
1800 32
1801 32
1802 32
1803 32
1804 32
1805 32
1806 32
1807 32
1808 32
1809 32
1810 32
1811 32
1812 32
1813 32
1814 32
1815 32
1816 32
1817 32
1818 32
1819 32
1820 32
1821 32
1822 32
1823 32
1824 32
1825 32
1826 32
1827 32
1828 32
1829 32
1830 32
1831 32
1832 32
1833 32
1834 32
1835 32
1836 32
1837 32
1838 32
1839 32
1840 32
1841 32
1842 32
1843 32
1844 32
1845 32
1846 32
1847 32
1848 32
1849 32
1850 32
1851 32
1852 32
1853 32
1854 32
1855 32
1856 32
1857 32
1858 32
1859 32
1860 32
1861 32
1862 32
1863 32
1864 32
1865 32
1866 32
1867 32
1868 32
1869 32
1870 32
1871 31.97
1872 31.95
1873 31.92
1874 31.89
1875 31.87
1876 31.84
1877 31.81
1878 31.79
1879 31.76
1880 31.73
1881 31.71
1882 31.68
1883 31.65
1884 31.63
1885 31.6
1886 31.57
1887 31.55
1888 31.52
1889 31.49
1890 31.47
1891 31.44
1892 31.41
1893 31.39
1894 31.36
1895 31.33
1896 31.31
1897 31.28
1898 31.25
1899 31.23
1900 31.2
1901 31.17
1902 31.14
1903 31.12
1904 31.09
1905 31.06
1906 31.04
1907 31.01
1908 30.98
1909 30.96
1910 30.93
1911 30.9
1912 30.88
1913 30.85
1914 30.82
1915 30.8
1916 30.77
1917 30.74
1918 11.88
1919 30.69
1920 30.66
1921 30.64
1922 30.61
1923 30.58
1924 30.56
1925 30.53
1926 30.5
1927 30.48
1928 30.45
1929 30.42
1930 30.4
1931 30.69
1932 30.99
1933 31.28
1934 31.58
1935 31.86
1936 32.15
1937 32.45
1938 32.74
1939 33.03
1940 33.32
1941 33.61
1942 33.9
1943 34.18
1944 34.47
1945 34.76
1946 35.04
1947 35.33
1948 35.62
1949 35.9
1950 36.19
1951 36.47
1952 36.75
1953 37.03
1954 37.31
1955 37.6
1956 37.88
1957 38.16
1958 38.44
1959 38.72
1960 39
1961 39.15
1962 39.31
1963 39.46
1964 39.62
1965 39.75
1966 39.89
1967 40.02
1968 40.15
1969 40.26
1970 40.37
1971 40.81
1972 41.26
1973 41.66
1974 44.57
1975 44.97
1976 45.43
1977 45.71
1978 46.12
1979 46.48
1980 46.67
1981 46.78
1982 46.96
1983 47.13
1984 47.36
1985 47.58
1986 47.83
1987 48.11
1988 48.5
1989 48.84
1990 49.23
1991 49.62
1992 49.93
1993 50.26
1994 50.21
1995 50.91
1996 51.17
1997 50.57
1998 50.74
1999 51.2
2000 52.27
2001 52.58
2002 52.86
2003 53.14
2004 53.19
2005 53.21
2006 53.81
2007 54.26
2008 54.51
2009 55.05
2010 55.65
2011 56.19
2012 56.67
2013 57.18
2014 57.6
2015 58.18
2016 58.83
2017 59.25
2018 59.66