1971

0.0

1967

0.0

1981

4.8

1974

6.1

1970

6.5

1976

0.0

1968

5.5

1960

5.3

1963

6.0

1969

5.6

1965

5.0

1971

5.2

1965

6.0

1980

0.0

1972

5.8

1968

5.0

1978

6.3

1966

5.7

1965

7.1

1975

8.0