50% (1963)

52% (1960)

66% (1961)

62% (1959)

40% (1957)

79% (1957)

40% (1960)

55% (1962)

60% (1958)

71% (1960)

69% (1959)

62% (1958)

65% (1958)

58% (1958)

50% (1959)

64% (1960)

57% (1961)

40% (1959)

50% (1961)

45% (1962)