1970

4.6

2012

6.0

2013

5.8

2016

8.9

2010

7.0

1967

7.8

2000

6.3

2017

9.2

1979

6.8

2012

0.0

2009

6.0

1997

7.8

2007

5.6

2004

6.0

2012

6.3

1982

8.1

2017

7.2

2020

7.8

2014

7.0