50% (1962)

56% (1956)

62% (1960)

54% (1959)

56% (1958)

64% (1967)

40% (1961)

58% (1964)

59% (1965)

56% (1965)

53% (1962)

55% (1957)

50% (1965)

52% (1957)

60% (1965)

50% (1957)

51% (1960)

54% (1965)

50% (1964)

50% (1957)