63% (1964)

62% (1959)

55% (1962)

45% (1961)

63% (1959)

64% (1964)

64% (1961)

69% (1960)

58% (1964)

55% (1967)

45% (1961)

37% (1968)

61% (1961)

0% (1958)

40% (1963)

50% (1957)

53% (1967)

45% (1962)

40% (1974)