73% (1987)

67% (1988)

59% (1988)

59% (1989)

56% (1988)

50% (1987)

59% (1989)

58% (1989)

60% (1990)

62% (1988)

61% (1989)

54% (1990)

61% (1987)

52% (1990)

69% (1987)

45% (1988)

42% (1988)

45% (1989)

57% (1986)

55% (1988)