2010

6.6

1970

7.3

2012

7.0

1998

6.3

2010

6.4

2011

6.8

2007

5.8

2004

7.5

2011

6.7

2005

5.9

2008

6.5

2002

7.6

1997

7.5

2008

6.1

2013

5.3

2014

7.4

1995

6.9

2008

6.5

2015

7.5

2001

7.0