1996

7.5

2001

6.5

2000

0.0

2000

8.0

2004

6.5

1999

8.2

1994

8.4

2005

6.2

2007

6.8

1997

5.5

2003

7.2

1989

8.3

1996

7.1

1998

5.5

2000

7.8