# year    value 
 1900 0.317318 
 1901 0.230906 
 1902 0.2767253 
 1903 0.09104177 
 1904 0.09499294 
 1905 0.146404 
 1906 0.2238088 
 1907 0.3241162 
 1908 0.2801718 
 1909 0.3431111 
 1910 0.3701112 
 1911 0.3697487 
 1912 0.375767 
 1913 0.2963042 
 1914 0.4006794 
 1915 0.3851508 
 1916 0.3827113 
 1917 0.4378499 
 1918 0.3900441 
 1919 0.3452298 
 1920 0.364319 
 1921 0.4474318 
 1922 0.3690352 
 1923 0.3979949 
 1924 0.3853515 
 1925 0.5097798 
 1926 0.4524272 
 1927 0.4378781 
 1928 0.4268147 
 1929 0.378543 
 1930 0.4420314 
 1931 0.4197091 
 1932 0.370018 
 1933 0.4277815 
 1934 0.4484908 
 1935 0.4586732 
 1936 0.4805501 
 1937 0.4533396 
 1938 0.4922809 
 1939 0.5485756 
 1940 0.456055 
 1941 0.4816416 
 1942 0.4564303 
 1943 0.4520291 
 1944 0.5163864 
 1945 0.4871215 
 1946 0.5346635 
 1947 0.4908228 
 1948 0.5110614 
 1949 0.5881425 
 1950 0.5397297 
 1951 0.4599248 
 1952 0.4387769 
 1953 0.5060258 
 1954 0.5522946 
 1955 0.561404 
 1956 0.498988 
 1957 0.5604394 
 1958 0.5571768 
 1959 0.5480192 
 1960 0.5122649 
 1961 0.5564301 
 1962 0.4974631 
 1963 0.5063549 
 1964 0.2896683 
 1965 0.3411665 
 1966 0.4280473 
 1967 0.536955 
 1968 0.501833 
 1969 0.4905687 
 1970 0.5418621 
 1971 0.601983 
 1972 0.6202189 
 1973 0.6090659 
 1974 0.5844567 
 1975 0.5592914 
 1976 0.5872369 
 1977 0.6139226 
 1978 0.5977276 
 1979 0.6858609 
 1980 0.7294411 
 1981 0.7305653 
 1982 0.6495256 
 1983 0.5469837 
 1984 0.6225224 
 1985 0.6706789 
 1986 0.7517664 
 1987  0.75883 
 1988 0.7585254 
 1989 0.8052009 
 1990 0.8122705 
 1991 0.8833931 
 1992 0.5639906 
 1993 0.6475899 
 1994 0.7412598 
 1995 0.7155799 
 1996 0.8082728 
 1997 0.8803674 
 1998 0.9146723 
 1999 0.9334445 
 2000 0.9236533 
 2001 1.039961 
 2002 1.098905 
 2003 1.060506 
 2004 0.968054 
 2005 1.125565