# year    value 
 1980 -0.8062963 
 1981 -0.7069201 
 1982 -0.8092412 
 1983 -0.9658835 
 1984 -0.7736664 
 1985 -0.7479613 
 1986 -0.8277577 
 1987 -0.8153892 
 1988 -0.6444357 
 1989 -0.5752133 
 1990 -0.6292096 
 1991 -0.7540521 
 1992 -0.8992056 
 1993 -0.7367572 
 1994 -0.6933979 
 1995 -0.6043137 
 1996 -0.6243076 
 1997 -0.5271711 
 1998 -0.526269 
 1999 -0.5464225 
 2000 -0.4303192 
 2001 -0.4417603 
 2002 -0.3741094 
 2003 -0.4380319 
 2004 -0.3844965 
 2005 -0.3833497