2011

7.3

2004

7.2

2006

7.9

2014

6.2

2005

6.2

2014

7.1

2017

6.3

2010

7.6

2013

6.9

1998

8.6

2016

7.5

2010

6.7

2015

7.7

1985

8.3

2014

7.5

1980

6.4

2009

6.4

1976

7.1

2015

6.1

2002

7.0