55% (1962)

62% (1964)

62% (1959)

63% (1959)

58% (1964)

45% (1961)

69% (1960)

40% (1963)

64% (1964)

53% (1967)

45% (1961)

55% (1967)

61% (1961)

64% (1961)

45% (1962)

0% (1958)

37% (1968)

40% (1974)

50% (1957)