48% (1986)

49% (1987)

34% (1986)

52% (1988)

44% (1989)

57% (1990)

59% (1986)

48% (1987)

36% (1991)

52% (1987)

53% (1988)

45% (1985)

47% (1993)

44% (1986)

46% (1992)

48% (1986)

41% (1990)

40% (1994)

51% (1989)

38% (1992)