56% (1964)

59% (1958)

62% (1963)

67% (1960)

50% (1961)

61% (1963)

50% (1959)

31% (1962)

64% (1965)

54% (1958)

54% (1957)

60% (1958)

55% (1960)

42% (1962)

54% (1958)

50% (1957)

50% (1960)

52% (1959)

70% (1960)

55% (1961)