2014

8.3

2011

8.1

2001

8.0

1989

7.7

2000

7.6

2010

8.2

2007

8.0

2013

8.1

2008

7.6

2015

8.2

2016

8.6

2004

8.1

2013

8.0

1983

7.7

2010

8.1

2010

8.0

2003

7.9

1996

6.4

2006

7.4

2002

7.5