1996

6.9

2011

6.2

2001

5.4

2006

0.0

2003

8.5

2012

7.5

2005

0.0

2008

8.0

2014

6.0

2006

4.5

2011

7.6

2002

7.7

2001

6.7

2007

7.8

2009

0.0

2009

4.5