32% (1987)

58% (1987)

49% (1988)

47% (1988)

48% (1984)

47% (1986)

48% (1987)

36% (1985)

31% (1986)

53% (1985)

52% (1986)

30% (1988)

52% (1989)

51% (1984)

42% (1989)

55% (1987)

50% (1988)

49% (1988)

40% (1986)

56% (1985)