2014

6.0

2012

6.3

2010

7.8

2017

6.7

2012

7.6

2009

6.8

2004

7.1

2007

8.2

2005

6.6

1990

7.4

1999

7.9

2001

4.9

2011

8.1

2004

5.4

2009

7.6