74% (1987)

67% (1988)

59% (1989)

59% (1988)

69% (1987)

62% (1988)

57% (1986)

55% (1990)

59% (1989)

50% (1987)

53% (1988)

56% (1988)

49% (1988)

55% (1989)

45% (1988)

49% (1989)

61% (1990)

61% (1987)

61% (1990)

38% (1987)