1996

7.6

1963

5.9

2001

5.2

2017

4.7

2012

5.4

2011

6.1

2014

7.5

2010

6.2

2013

4.8

2013

6.3

2011

5.9

1992

4.0

1965

6.7

1987

5.5

2008

6.1

2012

6.3

2013

6.1

2012

6.6

2008

6.2

2016

6.7