68% (1987)

55% (1987)

58% (1986)

52% (1985)

63% (1984)

63% (1986)

58% (1986)

53% (1987)

57% (1984)

58% (1985)

65% (1985)

64% (1986)

61% (1986)

56% (1985)

55% (1986)

61% (1984)

62% (1985)

64% (1987)

61% (1985)

57% (1987)