1996

6.5

2006

0.0

2004

6.6

2009

4.0

1998

6.0

2004

4.9

1994

7.2

2008

7.5

2004

5.8

1970

6.1

2001

6.2

2009

6.6

2003

4.0

2006

5.0

2001

0.0

1995

7.8

1992

3.4