2004

6.5

2002

6.5

2017

6.3

2001

6.8

2017

7.4

2017

6.6

2012

4.7

2016

7.2

2013

6.7

2014

7.0

2015

6.2

2009

5.7

2010

7.6

2007

5.6

2011

5.9

2014

7.1

2016

7.6

1946

5.8

2011

5.7

2017

6.8