2013

5.4

2010

8.1

2008

8.9

2007

7.9

2011

8.5

2012

8.4

2015

8.3

2013

8.7

2003

7.5

2005

8.2

2016

8.2

1989

8.0

2009

8.0

2005

7.7

1969

8.2

2014

7.9

2010

8.0

2016

8.0

2020

8.0

1993

8.4