1976

7.1

1971

7.8

1978

5.5

1978

7.1

1977

6.5

1974

8.0

1979

5.0

1957

6.6

1978

0.0

1953

7.7

1991

4.0

1975

6.7

1975

0.0

1979

7.1

1977

7.7