2012

6.5

2008

5.5

2009

3.7

2013

5.4

2015

6.1

2016

6.1

2009

6.3

2009

7.1

2011

6.7

2009

7.6

2019

8.1

2014

8.0

2017

7.4

2013

7.2

2017

7.6

1994

8.5

2018

7.5

2016

7.5

2005

7.1

2014

7.8