74% (1987)

67% (1988)

59% (1988)

59% (1989)

61% (1988)

56% (1988)

60% (1989)

54% (1990)

55% (1989)

69% (1987)

50% (1987)

61% (1990)

42% (1988)

62% (1987)

45% (1989)

45% (1988)

52% (1990)

49% (1989)

58% (1986)

58% (1989)