69% (1956)

58% (1972)

61% (1971)

66% (1973)

63% (1953)

59% (1975)

67% (1979)

68% (1947)

52% (1973)

54% (1975)

43% (1974)

53% (1973)

35% (1973)

63% (1972)

58% (1957)

53% (1977)

56% (1960)

60% (1974)

48% (1959)

62% (1970)