Year Years
1800 28.95
1801 28.95
1802 28.95
1803 28.95
1804 28.95
1805 28.95
1806 28.95
1807 28.95
1808 28.95
1809 28.95
1810 28.95
1811 28.95
1812 28.95
1813 28.95
1814 28.95
1815 28.95
1816 28.95
1817 28.95
1818 28.95
1819 28.95
1820 28.95
1821 28.95
1822 28.95
1823 28.95
1824 28.95
1825 28.95
1826 28.95
1827 28.95
1828 28.95
1829 28.95
1830 28.95
1831 28.95
1832 28.95
1833 28.95
1834 28.95
1835 28.95
1836 28.95
1837 28.95
1838 28.95
1839 28.95
1840 28.95
1841 28.95
1842 28.95
1843 28.95
1844 28.95
1845 28.95
1846 28.95
1847 28.95
1848 28.95
1849 28.95
1850 28.95
1851 28.95
1852 28.95
1853 28.95
1854 28.95
1855 28.95
1856 28.95
1857 28.95
1858 28.95
1859 28.95
1860 28.95
1861 28.95
1862 28.95
1863 28.95
1864 28.95
1865 28.95
1866 28.95
1867 28.95
1868 28.95
1869 28.95
1870 28.95
1871 28.98
1872 29.01
1873 29.05
1874 29.08
1875 29.11
1876 29.14
1877 29.17
1878 29.21
1879 29.24
1880 29.27
1881 29.3
1882 29.33
1883 29.36
1884 29.4
1885 29.43
1886 29.46
1887 29.49
1888 29.52
1889 29.56
1890 29.59
1891 29.62
1892 29.65
1893 29.68
1894 29.72
1895 29.75
1896 29.78
1897 29.81
1898 29.84
1899 29.88
1900 29.91
1901 29.94
1902 29.97
1903 30
1904 30.03
1905 30.07
1906 30.1
1907 30.13
1908 30.16
1909 30.19
1910 30.23
1911 30.26
1912 30.29
1913 30.32
1914 30.35
1915 30.39
1916 30.42
1917 30.45
1918 9.9
1919 30.51
1920 30.55
1921 30.58
1922 30.61
1923 30.64
1924 30.67
1925 30.7
1926 30.74
1927 30.77
1928 30.8
1929 30.83
1930 30.86
1931 30.9
1932 30.93
1933 30.96
1934 30.99
1935 31.02
1936 31.06
1937 31.09
1938 31.12
1939 31.15
1940 31.18
1941 31.22
1942 22.67
1943 20.53
1944 17.3
1945 16.24
1946 21.68
1947 28.21
1948 31.44
1949 31.47
1950 31.5
1951 31.81
1952 32.39
1953 32.97
1954 33.56
1955 34.14
1956 34.73
1957 35.31
1958 35.89
1959 36.48
1960 37.06
1961 37.65
1962 38.24
1963 38.83
1964 39.42
1965 40.06
1966 40.79
1967 41.61
1968 42.47
1969 43.29
1970 43.88
1971 44.56
1972 45.21
1973 45.93
1974 46.66
1975 42.98
1976 44.75
1977 44.95
1978 44.43
1979 43.98
1980 46.96
1981 49.19
1982 50.73
1983 51.8
1984 53.29
1985 54.45
1986 55.39
1987 56.42
1988 56.86
1989 57.14
1990 58
1991 58.25
1992 59.16
1993 59.69
1994 60.58
1995 60.89
1996 62.45
1997 61.55
1998 61.79
1999 55.72
2000 63.69
2001 64.31
2002 64.8
2003 65.23
2004 66.16
2005 67.18
2006 68.32
2007 69.21
2008 70.04
2009 70.61
2010 71.1
2011 71.6
2012 72.05
2013 72.33
2014 72.46
2015 72.56
2016 72.69
2017 73.02
2018 73.34