1978

6.7

1970

0.0

1976

6.2

1973

0.0

1976

8.5

1972

6.5

1977

7.5

1970

0.0

1974

2.0

1973

2.0

1970

2.0

1990

6.0

1971

5.3

1968

8.0

1967

6.8

1980

4.1

1978

7.7

1970

6.1

1988

7.3

1976

0.0

1969

0.0