1992

6.9

1983

7.9

2011

7.3

2012

5.8

2004

6.5

2006

6.4

2000

7.8

2003

6.6

2008

8.5

2016

7.5

2013

6.9

2008

6.2

2015

7.3

2007

5.6

2011

6.5

2012

6.3

2013

6.3

1996

6.9

2014

6.2

2011

6.5