2000

7.1

2004

6.3

2007

5.4

2007

5.0

1998

8.5

1998

6.7

1999

6.0

2009

7.0

2004

6.1

2005

7.4

2006

8.2

1997

6.2

2003

6.5

2007

6.5

2006

4.0