2011

6.3

2014

8.3

2012

7.6

2004

8.2

2017

8.1

1989

8.3

2016

7.3

2006

7.5

1997

8.1

2011

8.5

2013

8.0

1987

8.4

2008

8.9

2001

7.6

2013

7.5

2016

8.6

2005

8.3

2012

6.8

2014

7.8

2007

8.2