2014

6.5

1997

6.1

2009

6.7

2002

6.9

2007

4.9

2016

6.4

1999

7.1

2013

5.2

2008

6.1

1993

5.8

2012

6.2

2009

6.8

2012

6.5

2008

7.0

2016

7.2

2001

5.9

2010

6.8

2016

9.7

2011

5.6

1984

6.5