2006

7.0

2020

3.7

2008

7.3

2014

6.5

2001

6.7

2012

6.0

2010

7.0

1979

6.8

2011

5.8

2007

6.5

1999

8.0

1967

7.8

2011

5.2

2009

4.1

2013

7.7

1953

6.6

1982

5.9

1999

6.0

2010

6.0