2011

7.8

2013

8.0

2015

6.8

2012

6.6

1996

7.9

2009

7.4

1982

7.9

2016

8.2

2006

7.9

2016

7.6

2014

6.5

1970

7.3

2016

5.9

2005

8.1

1995

6.9

2007

7.2

2016

8.2

1985

8.3

2012

7.7

1999

7.6