2006

4.2

1996

4.5

1997

8.1

1995

7.3

2000

6.0

2000

7.9

2008

5.2

2004

6.3

2011

7.3

2009

2.0

2006

6.8

2001

5.7

1995

6.5

2005

8.6

2009

6.6

2007

5.9

2015

6.8

2005

7.5

2006

5.7

1998

6.8