1989 3.08
 1990 3.84
 1991 4.08
 1992 3.21
 1993 5.23
 1994 2.97
 1995 2.53
 1996 2.8
 1997 2.78
 1998 3.15
 1999 2.32
 2000 2.4
 2001 2.46

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