57% (1986)

68% (1987)

62% (1985)

57% (1984)

58% (1986)

60% (1986)

61% (1984)

55% (1987)

53% (1987)

58% (1985)

63% (1986)

57% (1987)

64% (1987)

65% (1985)

63% (1984)

56% (1985)

52% (1985)

57% (1985)

54% (1986)

38% (1987)