Year Years
1800 33.87
1801 33.87
1802 33.87
1803 33.87
1804 33.87
1805 33.87
1806 33.87
1807 33.87
1808 33.87
1809 33.87
1810 33.87
1811 33.87
1812 33.87
1813 33.87
1814 33.87
1815 33.87
1816 33.87
1817 33.87
1818 33.87
1819 33.87
1820 33.87
1821 33.87
1822 33.87
1823 33.87
1824 33.87
1825 33.87
1826 33.87
1827 33.87
1828 33.87
1829 33.87
1830 33.87
1831 33.87
1832 33.87
1833 33.87
1834 33.87
1835 33.87
1836 33.87
1837 33.87
1838 33.87
1839 33.87
1840 33.87
1841 33.87
1842 33.87
1843 33.87
1844 33.87
1845 33.87
1846 33.87
1847 33.87
1848 33.87
1849 33.87
1850 33.87
1851 33.87
1852 33.87
1853 33.87
1854 33.87
1855 33.87
1856 33.87
1857 33.87
1858 33.87
1859 33.87
1860 33.87
1861 33.87
1862 33.87
1863 33.87
1864 33.87
1865 33.87
1866 33.87
1867 33.87
1868 33.87
1869 33.87
1870 33.87
1871 33.87
1872 33.87
1873 33.87
1874 33.87
1875 33.87
1876 33.87
1877 33.87
1878 33.87
1879 33.87
1880 33.87
1881 33.87
1882 33.54
1883 33.22
1884 32.9
1885 32.57
1886 32.25
1887 31.92
1888 31.6
1889 31.28
1890 30.95
1891 31.51
1892 32.06
1893 32.62
1894 33.17
1895 33.73
1896 34.28
1897 34.84
1898 35.39
1899 35.95
1900 36.5
1901 36.64
1902 36.78
1903 36.92
1904 37.06
1905 36.71
1906 36.36
1907 36.01
1908 35.66
1909 35.31
1910 34.96
1911 34.61
1912 34.26
1913 33.91
1914 33.56
1915 33.22
1916 32.87
1917 33.07
1918 28.89
1919 33.47
1920 33.67
1921 33.87
1922 34.65
1923 35.43
1924 36.22
1925 37
1926 37.78
1927 38.57
1928 39.35
1929 38.6
1930 37.85
1931 37.1
1932 36.36
1933 35.61
1934 34.86
1935 34.11
1936 33.36
1937 34.86
1938 36.36
1939 37.85
1940 39.35
1941 41.2
1942 43.05
1943 42.74
1944 42.42
1945 42.1
1946 41.78
1947 41.94
1948 42.1
1949 42.25
1950 42.41
1951 44.06
1952 45.72
1953 48.82
1954 51.92
1955 55.02
1956 58.12
1957 59.01
1958 59.91
1959 60.81
1960 61.71
1961 62.09
1962 62.47
1963 62.85
1964 63.24
1965 63.62
1966 64
1967 64.38
1968 64.76
1969 65.14
1970 65.53
1971 65.36
1972 65.2
1973 65.03
1974 64.87
1975 64.7
1976 64.54
1977 64.37
1978 64.21
1979 64.05
1980 63.54
1981 63.17
1982 63.27
1983 63.37
1984 63.54
1985 63.92
1986 64.33
1987 64.75
1988 64.68
1989 64.77
1990 65.16
1991 65.12
1992 65.28
1993 65.66
1994 65.97
1995 65.7
1996 65.84
1997 65.87
1998 66.23
1999 66.47
2000 67.03
2001 67.67
2002 68.23
2003 68.51
2004 68.88
2005 69.29
2006 69.58
2007 70.04
2008 70.28
2009 70.53
2010 70.78
2011 71.03
2012 71.28