2009

5.5

1997

5.2

1989

6.7

1996

6.9

2000

7.0

1994

5.6

2004

5.9

1995

6.3

1999

6.2

1995

7.3

1999

8.2

2001

7.7

1996

7.1

2001

5.5

2001

6.6

2005

4.5