70% (1975)

61% (1984)

68% (1976)

64% (1978)

72% (1971)

59% (1981)

63% (1979)

82% (1974)

53% (1973)

58% (1976)

71% (1968)

64% (1974)

58% (1979)

39% (1971)

46% (1973)

41% (1974)

52% (1982)

56% (1973)

54% (1973)

80% (1972)