# year    value 
 1980 -0.9717867 
 1981 -0.9332358 
 1982 -1.040747 
 1983 -1.115699 
 1984 -0.9766185 
 1985 -0.9961115 
 1986 -1.019443 
 1987 -0.9758829 
 1988 -0.8775935 
 1989 -0.8044501 
 1990 -0.8246854 
 1991 -0.9833283 
 1992 -1.076313 
 1993 -0.9807371 
 1994 -0.9014145 
 1995 -0.8698052 
 1996 -0.8178389 
 1997 -0.7655295 
 1998 -0.7582867 
 1999 -0.7614942 
 2000 -0.6730313 
 2001 -0.6643853 
 2002 -0.6441904 
 2003 -0.6377808 
 2004 -0.6401072 
 2005 -0.5872306