1992

8.2

1996

7.0

1992

0.0

2011

6.3

2011

7.0

2000

5.3

1998

3.8

2008

4.0

2009

6.3

1998

4.0

2003

0.0

1999

7.5

2011

10.0

2005

3.0

2012

8.0

1995

7.6

2001

5.6

2010

6.7