68% (1987)

61% (1985)

58% (1986)

53% (1987)

55% (1987)

59% (1986)

52% (1985)

56% (1985)

33% (1987)

63% (1984)

64% (1987)

64% (1986)

58% (1985)

38% (1987)

47% (1987)

57% (1984)

61% (1984)

57% (1985)

62% (1985)

57% (1987)