56% (1958)

58% (1964)

62% (1960)

51% (1960)

50% (1962)

56% (1956)

53% (1962)

54% (1959)

40% (1961)

52% (1957)

50% (1957)

50% (1964)

60% (1960)

64% (1967)

53% (1963)

59% (1965)

56% (1965)

50% (1959)

50% (1965)

60% (1965)