2008

4.7

2009

5.9

2011

8.3

1997

6.9

1993

5.5

2002

6.6

2004

6.4

2007

6.3

2001

4.7

2006

5.7

2007

5.6

2005

5.4

2012

0.0

1999

7.0

2004

6.2