1998

7.1

2001

7.8

2000

8.0

2009

7.4

2012

8.2

2011

7.0

2010

7.8

2006

8.1

2009

7.1

1994

8.4

2013

7.5

2004

7.3

1995

7.8

2001

7.8

2015

7.8

2011

7.6

2017

8.4

2001

7.6

2012

7.4

2006

7.4