40% (1961)

51% (1960)

62% (1960)

58% (1964)

59% (1965)

64% (1967)

54% (1965)

50% (1964)

56% (1957)

52% (1957)

50% (1957)

60% (1960)

50% (1962)

55% (1958)

61% (1964)

53% (1963)

50% (1962)

50% (1965)

50% (1959)

50% (1957)