68% (1987)

57% (1984)

58% (1986)

52% (1985)

56% (1987)

53% (1987)

59% (1986)

63% (1984)

65% (1987)

65% (1985)

56% (1985)

63% (1986)

57% (1985)

58% (1985)

61% (1985)

61% (1984)

63% (1985)

32% (1987)

47% (1987)

65% (1987)