2002 7.2

2002 6.5

2001 6.3

2001 6.2

2001 7.5

2000 7.7

2000 6.1

2000 5.8

2000 7.9

1999 7.2

1998 7.3

1998 8.0

1998 6.9

1997 6.9

1997 7.4

1996 7.7

1996 6.8

1993 5.8

1992 6.6

1991 7.2