56% (1964)

54% (1957)

54% (1958)

50% (1959)

62% (1963)

64% (1965)

50% (1960)

42% (1962)

61% (1963)

60% (1958)

31% (1962)

50% (1957)

59% (1958)

37% (1961)

55% (1960)

54% (1958)

51% (1958)

50% (1961)

55% (1961)

52% (1959)