# year    value 
 1900 0.2615075 
 1901 0.3977504 
 1902 0.2402571 
 1903 -0.1025103 
 1904 -0.03922113 
 1905 0.1489163 
 1906 0.2250804 
 1907 0.1450216 
 1908 0.1580734 
 1909 0.2749393 
 1910 0.2820993 
 1911 0.1937587 
 1912 -0.05897174 
 1913 0.01636217 
 1914 0.1566709 
 1915 0.2624092 
 1916 0.2956188 
 1917 0.3859906 
 1918 0.4128039 
 1919 0.4132526 
 1920 0.2719647 
 1921 0.3033649 
 1922 0.4168108 
 1923 0.4559096 
 1924 0.356537 
 1925 0.4516629 
 1926 0.4677428 
 1927 0.5139334 
 1928 0.4457684 
 1929 0.3164391 
 1930 0.4588283 
 1931 0.4416782 
 1932 0.4347041 
 1933 0.3105893 
 1934 0.4498183 
 1935 0.4266935 
 1936 0.4149791 
 1937 0.5116945 
 1938 0.4520898 
 1939 0.4095398 
 1940 0.4306357 
 1941 0.4896988 
 1942 0.4023596 
 1943 0.4867571 
 1944 0.4764259 
 1945 0.4638214 
 1946 0.3983351 
 1947 0.5117018 
 1948 0.4187357 
 1949  0.45517 
 1950 0.4885078 
 1951 0.4009138 
 1952 0.3985818 
 1953 0.4872749 
 1954 0.552222 
 1955 0.4273968 
 1956 0.4816574 
 1957 0.4331173 
 1958 0.4165457 
 1959 0.4785819 
 1960  0.43174 
 1961 0.4468184 
 1962 0.4555987 
 1963 0.3526995 
 1964 0.1877774 
 1965 0.1960958 
 1966 0.3428689 
 1967 0.371881 
 1968 0.2398099 
 1969 0.1487471 
 1970 0.3514549 
 1971 0.4408749 
 1972 0.4766226 
 1973 0.4197596 
 1974 0.3978643 
 1975 0.4372867 
 1976 0.4478021 
 1977 0.4352054 
 1978 0.5933192 
 1979 0.6962923 
 1980 0.669579 
 1981 0.7464122 
 1982 0.5727205 
 1983 0.3532306 
 1984 0.5430437 
 1985 0.7292255 
 1986 0.6098899 
 1987 0.7401218 
 1988 0.8040492 
 1989 0.8717361 
 1990 0.8690795 
 1991 0.8439698 
 1992 0.3772808 
 1993 0.6426432 
 1994 0.8700243 
 1995 0.9577327 
 1996 0.9421403 
 1997 1.125796 
 1998 1.097226 
 1999  1.25173 
 2000 1.288699 
 2001 1.302947 
 2002 1.418174 
 2003 1.414616 
 2004   1.3765 
 2005 1.418908