# year    value 
 1980 -0.9732794 
 1981 -1.016525 
 1982 -1.111016 
 1983 -1.495315 
 1984 -1.161072 
 1985 -1.223271 
 1986 -1.119646 
 1987 -1.170776 
 1988 -1.252018 
 1989 -0.8730351 
 1990 -0.9770047 
 1991 -0.8675253 
 1992 -1.254956 
 1993 -1.15259 
 1994 -0.6525334 
 1995 -0.8111455 
 1996 -0.9159904 
 1997 -0.8866525 
 1998 -0.677411 
 1999 -0.8021469 
 2000 -0.4658294 
 2001 -0.5628713 
 2002 -0.7876068 
 2003 -0.4857853 
 2004 -0.4296268 
 2005 -0.4693811