# year    value 
 1900 0.5800538 
 1901 0.536022 
 1902 0.5291905 
 1903 0.2060954 
 1904 0.216581 
 1905 0.3808874 
 1906 0.4620563 
 1907 0.5438332 
 1908 0.4635071 
 1909 0.5525419 
 1910 0.5539913 
 1911 0.6191447 
 1912 0.6263102 
 1913 0.4957867 
 1914 0.5195168 
 1915 0.5009771 
 1916 0.7206548 
 1917 0.6544181 
 1918 0.6323012 
 1919 0.6567723 
 1920 0.6372241 
 1921 0.6246941 
 1922 0.7039845 
 1923 0.7415408 
 1924 0.7564601 
 1925 0.7802667 
 1926 0.7597939 
 1927 0.741889 
 1928 0.664664 
 1929 0.7069617 
 1930 0.6312453 
 1931 0.6905031 
 1932 0.745014 
 1933 0.7507628 
 1934 0.6199707 
 1935 0.7566366 
 1936 0.8194936 
 1937 0.6831724 
 1938 0.8254877 
 1939 0.7680081 
 1940 0.7727767 
 1941 0.7106903 
 1942 0.7577199 
 1943 0.8130879 
 1944 0.8074972 
 1945 0.757261 
 1946 0.7615879 
 1947 0.8026749 
 1948 0.8052093 
 1949 0.836993 
 1950 0.8224973 
 1951 0.7807155 
 1952 0.8162704 
 1953 0.8629302 
 1954 0.8003204 
 1955 0.7624503 
 1956 0.7866062 
 1957 0.8170522 
 1958 0.7612581 
 1959 0.7318968 
 1960 0.8203036 
 1961 0.7643353 
 1962 0.8197268 
 1963  0.73401 
 1964 0.5737343 
 1965 0.5274172 
 1966 0.6032815 
 1967 0.6919153 
 1968 0.6048095 
 1969 0.6534927 
 1970 0.6808921 
 1971 0.7536198 
 1972 0.835915 
 1973 0.9136212 
 1974 0.8013682 
 1975 0.7838775 
 1976 0.8820106 
 1977 0.9107378 
 1978 0.9082914 
 1979 0.9249371 
 1980 1.075069 
 1981 1.069272 
 1982 0.9396361 
 1983 0.7531303 
 1984 0.8841527 
 1985 0.9946858 
 1986 0.9041596 
 1987 0.9666874 
 1988 1.141422 
 1989 1.136261 
 1990 1.176615 
 1991 1.231981 
 1992 0.6494983 
 1993 0.858611 
 1994 1.021248 
 1995  1.08864 
 1996 1.202382 
 1997 1.269495 
 1998 1.352813 
 1999 1.315831 
 2000 1.353866 
 2001 1.409174 
 2002 1.553236 
 2003 1.500564 
 2004 1.521515 
 2005 1.502526