1989

2.5

1975

5.0

1981

5.5

1972

7.9

1980

7.3

1976

4.5

1984

7.5

1974

6.2

1987

6.8

1987

5.2

1981

4.7

1977

6.3

1977

0.0

1978

8.0

1978

6.7

1988

7.3

1979

0.0