# year    value 
 1980 -1.180137 
 1981 -1.097926 
 1982 -1.064562 
 1983  -1.4701 
 1984 -1.196073 
 1985 -1.270338 
 1986 -1.180812 
 1987 -1.115363 
 1988 -1.053985 
 1989 -0.8574541 
 1990 -0.8527452 
 1991 -0.8634034 
 1992 -1.313874 
 1993 -1.245613 
 1994 -1.023839 
 1995 -0.9735304 
 1996 -0.9065278 
 1997 -0.797587 
 1998 -0.7519505 
 1999 -0.771892 
 2000 -0.5866621 
 2001 -0.5302649 
 2002 -0.6524717 
 2003 -0.5527031 
 2004 -0.4805171 
 2005 -0.4802651