2016

6.8

2006

6.4

2015

6.2

2008

6.7

2010

7.2

2011

5.9

2007

10.0

1999

6.7

2002

6.0

1993

5.5

2005

6.1

2006

7.5

1984

6.1

2008

7.4

1996

5.9

2007

6.9

2014

7.7

2016

7.0

2013

4.2

2012

5.2