77% (1955)

71% (1958)

67% (1963)

69% (1960)

66% (1967)

43% (1957)

77% (1957)

50% (1955)

58% (1958)

62% (1958)

50% (1959)

55% (1957)

42% (1962)

53% (1957)

60% (1966)

40% (1959)

45% (1951)

47% (1966)

60% (1962)

54% (1951)