2011

8.1

2012

7.1

2006

7.6

1988

6.5

2004

6.5

2005

6.8

2016

7.0

1993

6.5

2006

6.8

2000

6.6

1984

7.2

2014

6.3

2013

6.5

2009

6.7

2006

6.4

2008

7.4

2007

7.3

1954

6.7

2010

7.2

2013

6.2