# year    value 
 1940 -0.4994214 
 1941 -0.5065579 
 1942 -0.4474994 
 1943 -0.4532251 
 1944 -0.397216 
 1945 -0.4622531 
 1946 -0.4701411 
 1947 -0.382991 
 1948 -0.426785 
 1949 -0.4301477 
 1950 -0.3760197 
 1951 -0.4716464 
 1952 -0.4864531 
 1953 -0.4078314 
 1954 -0.447091 
 1955 -0.3875681 
 1956 -0.4726042 
 1957 -0.4441718 
 1958 -0.5086265 
 1959 -0.4654209 
 1960 -0.5062284 
 1961 -0.4985818 
 1962 -0.3915971 
 1963 -0.5575699 
 1964 -0.720739 
 1965 -0.7086275 
 1966 -0.6245642 
 1967 -0.6461262 
 1968 -0.7268171 
 1969 -0.7031221 
 1970 -0.5655895 
 1971 -0.4915583 
 1972 -0.4954301 
 1973 -0.3702041 
 1974 -0.4074891 
 1975 -0.500967 
 1976 -0.4631908 
 1977 -0.3386183 
 1978 -0.3500723 
 1979 -0.2979513 
 1980 -0.2786918 
 1981 -0.2138307 
 1982 -0.3474031 
 1983 -0.5999801 
 1984 -0.3642318 
 1985 -0.3080992 
 1986 -0.2731476 
 1987 -0.2613291 
 1988 -0.1076192 
 1989 -0.0970328 
 1990 -0.08414423 
 1991 -0.09246849 
 1992 -0.5552886 
 1993 -0.3915872 
 1994 -0.2005932 
 1995 -0.07999705 
 1996 0.03638629 
 1997 0.04574505 
 1998 0.08822604 
 1999 0.1106964 
 2000 0.2250351 
 2001 0.2689203 
 2002 0.3327533 
 2003 0.2933466 
 2004 0.3654275 
 2005 1.348256