2010

7.8

2015

4.1

2017

4.2

1947

6.9

2009

7.6

2014

7.0

1982

6.6

2008

6.1

1991

6.2

2017

6.6

2020

8.2

1996

6.0

1953

6.6

2006

5.7

1983

4.7

2012

3.7

2013

6.3

2016

6.1

1955

3.8

2013

5.0