2010

6.0

2011

5.8

2013

8.1

2008

7.3

2009

7.5

2006

5.8

2014

7.8

2008

6.7

2014

7.5

2011

5.0

1997

7.6

1972

7.4

2019

5.2

2015

6.3

1991

8.1

2016

5.9

2005

6.6

2012

6.2

2006

5.5

1998

7.5