76% (1986)

69% (1989)

69% (1987)

59% (1986)

51% (1986)

59% (1986)

64% (1988)

56% (1988)

63% (1987)

68% (1987)

51% (1986)

61% (1986)

42% (1988)

64% (1988)

46% (1988)

59% (1987)

61% (1986)

42% (1989)

45% (1987)

60% (1987)