1989 3.08
 1990 3.1
 1991 3.08
 1992 3.21
 1993 5.0
 1994 2.27
 1995 3.53
 1996 3.8
 1997 2.8
 1998 4.15
 1999 3.32
 2000 1.4
 2001 2.46

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