1989

8.1

2002

5.6

1999

6.6

2000

4.8

1998

7.0

2008

0.0

2009

6.3

2001

7.8

1997

7.5

2001

7.7

2000

6.5

2003

0.0

2004

0.0

2005

5.3

1998

0.0