1976

7.0

1980

6.0

1997

6.8

1993

7.1

2002

6.0

1971

5.4

1977

6.1

1999

7.5

1974

0.0

1975

6.9

1996

6.9

1995

7.3

1980

0.0

1991

5.0

1979

5.0

1979

7.4

2000

6.8

1971

7.1

1997

7.7

1998

10.0

1994

7.2

1972

5.8

1974

6.1

1994

6.0