1997

8.1

2005

6.6

1998

7.4

2008

5.2

1998

0.0

2007

6.0

2002

7.0

1995

7.2

1998

6.8

1996

7.8

2006

5.0

2000

5.3

1999

1.0

2006

5.8

2003

9.3

2010

6.4