2017

5.5

2011

6.3

2012

6.4

2011

6.8

2008

7.0

2013

6.3

2013

6.9

1980

8.4

2015

7.4

2013

5.9

2002

6.6

1983

7.3

2009

5.6

2003

7.0

2002

6.4

2009

7.1

1967

6.6

1993

7.1

2011

6.9

2012

6.9