# year    value 
 1960 -0.5336047 
 1961 -0.5501759 
 1962 -0.5804655 
 1963 -0.6650983 
 1964 -0.8052252 
 1965 -0.7956649 
 1966 -0.7437432 
 1967 -0.7248398 
 1968 -0.7712603 
 1969 -0.8368754 
 1970 -0.7035127 
 1971 -0.6315515 
 1972 -0.56381 
 1973 -0.591778 
 1974 -0.5647239 
 1975 -0.6002385 
 1976 -0.5625675 
 1977 -0.5159414 
 1978 -0.4078145 
 1979 -0.3587087 
 1980 -0.3578514 
 1981 -0.2406983 
 1982 -0.3863734 
 1983 -0.65458 
 1984 -0.4524817 
 1985 -0.4025908 
 1986 -0.3443234 
 1987 -0.2792715 
 1988 -0.1903016 
 1989 -0.1063365 
 1990 -0.06378269 
 1991 -0.08572767 
 1992 -0.562551 
 1993 -0.4218297 
 1994 -0.166939 
 1995 -0.09222153 
 1996 -0.05883092 
 1997 0.05813337 
 1998 0.09962864 
 1999 0.1065874 
 2000 0.2620803 
 2001 0.2933648 
 2002 0.3200358 
 2003 0.4045175 
 2004 0.3888848 
 2005 1.414872