Year Years
1800 23.94
1801 23.94
1802 23.94
1803 23.94
1804 23.94
1805 23.94
1806 23.94
1807 23.94
1808 23.94
1809 23.94
1810 23.94
1811 23.94
1812 23.94
1813 23.94
1814 23.94
1815 23.94
1816 23.94
1817 23.94
1818 23.94
1819 23.94
1820 23.94
1821 23.94
1822 23.94
1823 23.94
1824 23.94
1825 23.94
1826 23.94
1827 23.94
1828 23.94
1829 23.94
1830 23.94
1831 23.94
1832 23.94
1833 23.94
1834 23.94
1835 23.94
1836 23.94
1837 23.94
1838 23.94
1839 23.94
1840 23.94
1841 23.94
1842 23.94
1843 23.94
1844 23.94
1845 23.94
1846 23.94
1847 23.94
1848 23.94
1849 23.94
1850 23.94
1851 23.94
1852 23.94
1853 23.94
1854 23.94
1855 23.94
1856 23.94
1857 23.94
1858 23.94
1859 23.94
1860 23.94
1861 23.94
1862 23.94
1863 23.94
1864 23.42
1865 22.89
1866 22.37
1867 21.85
1868 21.32
1869 21.37
1870 21.41
1871 21.45
1872 21.49
1873 21.53
1874 21.73
1875 21.92
1876 22.12
1877 22.32
1878 22.51
1879 22.71
1880 22.91
1881 23.1
1882 23.3
1883 23.49
1884 23.69
1885 23.89
1886 24.08
1887 24.28
1888 24.47
1889 24.67
1890 24.86
1891 25.06
1892 25.26
1893 25.45
1894 25.65
1895 25.84
1896 26.04
1897 26.23
1898 26.06
1899 25.9
1900 25.72
1901 25.97
1902 26.21
1903 26.46
1904 26.7
1905 26.95
1906 27.19
1907 27.44
1908 27.68
1909 27.92
1910 28.17
1911 31.11
1912 31.52
1913 29.36
1914 28.95
1915 28.54
1916 28.54
1917 25.56
1918 15.63
1919 21.05
1920 16.58
1921 11.91
1922 13.89
1923 29.57
1924 32.05
1925 31.15
1926 34.32
1927 33.66
1928 35.14
1929 33.9
1930 33.23
1931 27.48
1932 19.55
1933 15.59
1934 35.54
1935 37.08
1936 38.73
1937 37.74
1938 39.4
1939 41.77
1940 39.32
1941 28.69
1942 24.73
1943 23.74
1944 31.64
1945 39.05
1946 46.2
1947 38.29
1948 46.26
1949 49.02
1950 51.28
1951 51.5
1952 51.95
1953 52.38
1954 52.83
1955 53.27
1956 53.71
1957 54.15
1958 54.58
1959 55.02
1960 55.46
1961 55.9
1962 56.35
1963 56.79
1964 57.23
1965 57.67
1966 58.08
1967 58.5
1968 58.88
1969 59.25
1970 59.59
1971 60.12
1972 60.62
1973 61.08
1974 61.5
1975 61.88
1976 62.29
1977 62.73
1978 63.16
1979 63.54
1980 63.91
1981 64.18
1982 64.25
1983 64.32
1984 64.49
1985 65.25
1986 66.09
1987 66.32
1988 66.14
1989 65.96
1990 65.98
1991 65.99
1992 65.69
1993 65.01
1994 64.17
1995 64.13
1996 64.72
1997 65.37
1998 65.83
1999 66.2
2000 66.41
2001 66.65
2002 66.6
2003 66.59
2004 66.69
2005 66.63
2006 66.64
2007 66.93
2008 67.39
2009 68.05
2010 68.45
2011 69.1
2012 69.57
2013 70.13
2014 70.66
2015 71.07
2016 71.23
2017 71.34
2018 71.45