1997

7.0

1986

7.1

2002

7.7

1975

0.0

1975

0.0

2007

7.5

1987

4.6

2004

5.8

2005

4.6

2008

5.3

2002

0.0

1976

0.0

1980

0.0

1997

5.0

1982

7.2

1978

6.7

2000

6.6

2006

6.5