69% (1968)

35% (1976)

76% (1961)

47% (1958)

65% (1951)

40% (1971)

53% (1954)

30% (1953)

20% (1958)

40% (1957)

54% (1969)

40% (1953)

67% (1956)

40% (1956)

55% (1956)

52% (1950)

68% (1962)

63% (1952)

38% (1951)

40% (1979)