2006

4.2

1981

5.5

2001

6.4

1996

5.1

1979

6.1

2004

6.8

2002

4.0

1985

5.9

1997

5.5

2003

6.2

1985

5.3

1998

6.0

2004

4.2

1977

6.5

1992

5.5

2008

4.3

1995

0.0

1996

4.1

1979

4.3

1999

3.9