54% (1959)

64% (1967)

62% (1960)

58% (1964)

56% (1956)

50% (1957)

55% (1957)

56% (1957)

54% (1965)

56% (1958)

50% (1964)

51% (1960)

59% (1965)

50% (1959)

53% (1962)

50% (1965)

55% (1958)

52% (1957)

56% (1965)

50% (1962)