2011

7.3

2012

7.2

2006

6.4

1998

8.1

2013

6.9

2011

7.0

2009

5.9

2014

7.9

2003

6.7

1999

8.4

2005

7.5

2016

6.5

2011

6.8

2008

7.7

2017

7.6

2005

7.7

1994

8.7

2012

6.4

2000

7.0

2009

7.2