2005

7.8

2016

8.0

2008

8.9

2009

8.0

1980

7.7

2002

8.6

2003

7.5

2013

7.5

2006

5.7

2006

7.4

2016

8.6

2014

7.8

2012

7.1

2014

8.1

2008

7.9

2007

7.9

2004

8.1

2015

8.7

2010

8.5

2001

8.6