1996

6.5

2015

4.8

2010

5.3

2017

6.6

2013

6.0

2014

6.1

2008

0.0

2015

6.9

2008

0.0

2004

5.0

2014

6.0

2003

6.7

2005

6.1

2006

7.0

2005

0.0