1968

0.0

1980

7.0

1977

8.3

1976

4.5

1975

5.8

1983

6.7

1975

7.0

1984

6.0

1981

5.0

1982

8.0

1983

6.5

1978

6.3

1978

6.3

1973

7.2

1969

7.5

1985

7.5

1973

8.2

1979

6.3

1985

5.8

1975

6.5