1998

6.3

1997

0.0

2001

5.5

1997

5.7

1996

7.5

2004

7.0

2000

6.6

1996

6.8

2003

6.6

2001

8.0

2008

4.8

2009

4.6

2004

4.6

2002

5.9

2013

4.8