1997

6.6

2001

6.8

2005

0.0

2011

5.4

2002

7.9

2012

4.2

2003

7.2

1996

7.8

2016

7.0

2000

7.1

2009

6.0

2012

6.0

2012

8.1

2009

6.7

2007

0.0