1997

9.7

2005

5.3

2004

0.0

2006

8.2

1994

7.8

1989

6.7

1997

8.0

2000

6.2

1995

6.9

1999

7.9

2007

0.0

2005

7.5

2005

6.6

2001

6.6

2005

5.0

2000

7.1

2002

5.0

2001

7.0

1997

7.7

1999

7.9

2009

5.1