Year Hansen PER 2006 17.4 2005 15.6 2004 18.7 2003 19.8 2002 15.5 2001 15.1 2000 12.7 1999 27.9 1998 12.4 1997 12.3 1996 17.3 1995 14.2 1994 13.2 1993 22.6 1992 14.2 1991 13.1 1990 10 1989 11.2 1988 12.5 1987 12.2 -------------------------…