1978

0.0

1977

0.0

1971

6.4

1972

6.2

1974

7.9

1969

6.0

1978

4.3

1979

5.0

1977

0.0

1950

6.8

1965

7.3

1961

5.4

1970

7.8

1973

8.0

1962

7.4

1976

6.3

1981

5.2