69% (1960)

62% (1962)

77% (1955)

60% (1962)

71% (1958)

62% (1954)

42% (1962)

66% (1963)

62% (1958)

53% (1957)

58% (1948)

45% (1951)

50% (1955)

58% (1958)

47% (1966)

60% (1966)

50% (1959)

55% (1957)

66% (1967)

77% (1957)