# year    value 
 1900 0.8364503 
 1901 0.8452038 
 1902 0.6998432 
 1903 0.440834 
 1904 0.4334775 
 1905 0.7011386 
 1906 0.718439 
 1907 0.6624775 
 1908 0.7158417 
 1909 0.6851782 
 1910 0.751571 
 1911 0.8624079 
 1912 0.8929817 
 1913 0.5083008 
 1914 0.7647541 
 1915 0.7091134 
 1916 0.9443876 
 1917 0.8776067 
 1918 0.7676097 
 1919 0.9113832 
 1920 0.8961313 
 1921 0.8405182 
 1922 1.014083 
 1923 0.9302943 
 1924 1.156867 
 1925 0.9818342 
 1926  1.00149 
 1927 0.8971559 
 1928 0.8965414 
 1929 0.8986718 
 1930 0.7916694 
 1931 0.956149 
 1932  1.00617 
 1933 0.9080628 
 1934 0.9949179 
 1935 0.9825574 
 1936 0.9345061 
 1937 0.9478809 
 1938 0.920028 
 1939 0.9581639 
 1940 0.9587306 
 1941 0.9563189 
 1942 0.9289929 
 1943 0.8893375 
 1944  1.06445 
 1945 1.002554 
 1946 0.987876 
 1947 1.083211 
 1948 1.075188 
 1949 1.025304 
 1950 1.068855 
 1951 1.001864 
 1952 0.9156932 
 1953 1.095944 
 1954 0.9634833 
 1955 1.132234 
 1956 0.890597 
 1957 1.106141 
 1958  1.08558 
 1959 0.9264672 
 1960 1.026768 
 1961 0.934778 
 1962  1.17575 
 1963 0.9810433 
 1964 0.8838514 
 1965 0.7710322 
 1966 0.7923796 
 1967 0.8218644 
 1968 0.7388098 
 1969 0.7280552 
 1970 0.856105 
 1971 0.953587 
 1972 0.9963015 
 1973 1.097668 
 1974 0.9492241 
 1975 0.9862965 
 1976 1.079112 
 1977 1.112952 
 1978 1.194178 
 1979 1.150818 
 1980 1.214695 
 1981  1.27273 
 1982  1.31661 
 1983 0.8422704 
 1984 1.181337 
 1985 1.254849 
 1986 1.183045 
 1987 1.107033 
 1988 1.355817 
 1989 1.428387 
 1990 1.350529 
 1991 1.523002 
 1992 0.8219015 
 1993 0.9360302 
 1994 1.253633 
 1995 1.270122 
 1996 1.509204 
 1997 1.434868 
 1998 1.542659 
 1999 1.495013 
 2000 1.695858 
 2001 1.560632 
 2002  1.69313 
 2003 1.732467 
 2004 1.895747 
 2005 1.684853