68% (1987)

58% (1986)

59% (1986)

53% (1987)

61% (1985)

62% (1985)

57% (1984)

58% (1985)

63% (1984)

52% (1985)

65% (1987)

60% (1986)

64% (1986)

64% (1986)

43% (1986)

56% (1985)

61% (1984)

64% (1987)

65% (1985)

55% (1987)