# year    value 
 1980 -1.560916 
 1981 -1.545887 
 1982 -1.335182 
 1983 -1.626179 
 1984 -1.591558 
 1985 -1.595807 
 1986 -1.438118 
 1987 -1.328208 
 1988 -1.300395 
 1989 -1.220399 
 1990 -1.135246 
 1991 -1.284963 
 1992 -1.460879 
 1993 -1.619859 
 1994 -1.456827 
 1995 -1.138045 
 1996 -1.393308 
 1997 -1.131267 
 1998 -1.101892 
 1999 -0.9815582 
 2000 -0.673439 
 2001 -0.8114622 
 2002 -1.002682 
 2003 -0.7455379 
 2004 -0.9445452 
 2005 -1.064049