1987

8.0

2016

7.0

2015

7.6

2013

7.5

2013

8.0

2016

6.8

2009

7.6

1983

7.9

2002

7.2

2014

7.7

2011

6.2

2001

7.9

2007

6.7

2014

8.2

2000

7.4

2008

7.7

2014

7.7

2017

7.0

2013

7.9

2002

8.0