2008

8.9

1971

8.1

2011

7.1

2013

7.6

2014

8.4

1999

8.2

2003

8.2

2004

8.6

2012

7.0

2004

8.0

2017

7.5

2002

8.3

2014

8.3

2018

8.4

1997

8.1

2014

7.3

2013

7.5

1987

8.4

2017

8.5

2016

8.6