2005

6.8

2010

7.2

2012

5.0

2011

6.8

1996

7.6

2008

6.8

1998

7.4

2011

6.2

2007

6.9

2008

7.4

2016

7.0

2006

6.4

2013

6.1

2006

4.9

2014

7.0

2012

6.1

2004

7.5

2013

5.7

2013

6.0