# year    value 
 1980 -1.000475 
 1981 -0.9724687 
 1982 -1.08088 
 1983 -1.14167 
 1984 -1.011801 
 1985 -1.03913 
 1986 -1.052673 
 1987 -1.003705 
 1988 -0.9180125 
 1989 -0.8441894 
 1990 -0.8585721 
 1991 -1.023075 
 1992 -1.107016 
 1993 -1.023032 
 1994 -0.9374753 
 1995 -0.9158295 
 1996 -0.8513885 
 1997 -0.8068501 
 1998 -0.7985081 
 1999 -0.798778 
 2000 -0.7151067 
 2001 -0.7029786 
 2002 -0.6910104 
 2003 -0.6724083 
 2004 -0.6844186 
 2005 -0.6225744