57% (1984)

68% (1987)

58% (1986)

56% (1987)

59% (1986)

63% (1986)

52% (1985)

53% (1987)

63% (1984)

65% (1985)

65% (1987)

60% (1986)

57% (1985)

56% (1985)

55% (1986)

32% (1987)

61% (1985)

63% (1985)

43% (1986)

36% (1987)