1984

7.2

1966

6.5

2009

4.6

1965

6.7

7.1

2013

6.4

1995

5.9

1992

6.5

2007

5.6

2012

6.2

2007

7.1

1986

5.8

2006

6.5

2017

6.5

1947

7.3

2001

7.0

1998

6.8

2011

6.7

2014

6.5

2016

4.5