2017

6.1

2016

5.3

2014

7.3

2007

7.2

1988

6.5

2012

6.4

1966

6.3

2016

6.7

1992

6.2

2010

7.4

1999

6.6

2001

6.4

2012

6.9

2008

5.5

1943

8.2

2013

6.4

1983

5.5

2003

6.3

2007

6.4

2011

5.6