2004

4.7

2010

6.2

2017

7.8

1995

8.0

2015

7.1

1994

8.7

2013

6.1

2008

7.6

2008

8.5

2002

7.3

2011

7.0

2013

6.8

2016

7.4

2014

7.6

2010

6.7

2015

6.7

2017

7.6

2006

7.0

2015

6.9

2009

6.1