2002

7.5

2011

7.9

2001

7.6

2012

6.8

1993

7.9

2017

7.8

2008

8.1

2007

7.6

2015

8.7

2003

8.0

2010

7.9

2012

7.2

2004

8.2

1977

7.4

2005

8.5

2016

7.3

2010

7.8

2015

7.8

2013

7.9

2006

7.9