77% (1962)

73% (1960)

77% (1969)

65% (1951)

59% (1969)

70% (1956)

57% (1965)

56% (1971)

56% (1965)

73% (1959)

66% (1959)

64% (1958)

48% (1962)

47% (1960)

37% (1971)

62% (1955)

80% (1962)

50% (1971)

60% (1963)

64% (1961)