1997

6.5

2005

7.6

2000

6.1

2005

8.1

1999

8.5

1998

0.0

2004

5.9

2008

5.3

1996

6.9

2002

6.0

1998

5.5

1996

7.2

1995

6.5

1996

6.0

2003

7.0

1995

8.8

1993

8.4