1997

9.0

1976

0.0

1979

10.0

1989

0.0

1995

8.0

1991

7.2

2006

7.6

1994

7.2

1990

7.3

2001

7.0

1980

8.0

1996

6.0

1988

7.0

1999

8.5

2005

6.5