74% (1987)

56% (1988)

67% (1988)

59% (1989)

61% (1987)

59% (1989)

62% (1988)

53% (1990)

55% (1989)

61% (1990)

44% (1989)

50% (1987)

61% (1989)

43% (1988)

58% (1986)

68% (1987)

45% (1988)

52% (1990)

54% (1988)

58% (1989)