76% (1986)

59% (1986)

69% (1989)

59% (1986)

51% (1986)

69% (1987)

61% (1986)

64% (1987)

56% (1988)

67% (1987)

64% (1988)

51% (1986)

61% (1986)

42% (1989)

59% (1987)

61% (1987)

55% (1987)

46% (1988)

52% (1986)

40% (1988)