40% (1978)

55% (1978)

58% (1976)

44% (1982)

51% (1978)

68% (1975)

61% (1974)

48% (1979)

70% (1978)

65% (1979)

58% (1978)

52% (1982)

53% (1975)

47% (1976)

64% (1976)

75% (1974)

69% (1976)

61% (1981)

50% (1976)

56% (1975)