2006

6.0

2004

7.5

2008

6.9

2003

6.3

2006

6.9

2014

7.0

2002

7.0

2007

7.3

2011

6.5

2010

7.2

2005

6.8

1980

6.7

2001

6.4

1970

7.3

2006

6.3

1942

7.0

2003

7.1

2002

6.0

2008

6.7

2017

6.6