68% (1987)

58% (1986)

56% (1987)

57% (1984)

53% (1987)

52% (1985)

65% (1985)

63% (1984)

59% (1986)

57% (1985)

65% (1987)

56% (1985)

63% (1985)

32% (1987)

65% (1986)

63% (1986)

61% (1985)

58% (1985)

61% (1984)

60% (1986)