69% (1960)

64% (1964)

60% (1959)

63% (1964)

62% (1959)

64% (1961)

63% (1961)

52% (1962)

45% (1961)

58% (1964)

53% (1967)

44% (1961)

40% (1963)

40% (1974)

50% (1957)

0% (1958)

45% (1962)

50% (1968)