2017

5.0

2011

5.2

2014

7.7

1988

7.4

2001

6.6

2015

5.3

2009

5.7

2013

6.4

2011

6.4

2010

6.2

2013

5.7

2015

7.1

2014

6.2

2006

5.8

2003

7.8

2005

6.0

1999

6.3

2007

6.1

2015

5.7

2009

6.7