62% (1960)

59% (1965)

50% (1957)

55% (1957)

56% (1956)

50% (1962)

50% (1964)

56% (1958)

58% (1964)

40% (1961)

56% (1965)

52% (1957)

51% (1960)

54% (1965)

54% (1959)

64% (1967)

60% (1965)

50% (1965)

53% (1962)

60% (1960)