2005

7.3

2007

8.1

2011

7.6

2012

7.7

2001

7.0

2017

7.2

2009

8.3

2012

8.4

2016

7.9

2018

8.2

2015

6.9

2014

7.6

2015

7.8

2013

6.7

1995

7.3

1998

7.2

2015

5.9

2007

7.6

2014

7.6

2009

6.9