70% (1968)

46% (1986)

69% (1963)

54% (1976)

63% (1972)

62% (1971)

58% (1976)

43% (1973)

59% (1973)

63% (1970)

55% (1970)

52% (1968)

61% (1970)

53% (1973)

59% (1968)

65% (1966)

35% (1972)

59% (1965)

48% (1968)

47% (1972)