2003

6.3

2002

6.0

2007

5.6

2016

6.3

2009

6.1

2005

6.3

2006

6.1

2013

7.0

2013

6.7

2011

5.7

2014

7.2

1977

5.3

2007

5.7

1999

6.2

1992

7.3

2004

6.2

2005

6.1

2015

5.3

2015

6.8

2005

5.1