58% (1986)

51% (1987)

49% (1987)

53% (1988)

48% (1986)

57% (1990)

36% (1991)

45% (1985)

52% (1988)

49% (1990)

43% (1995)

44% (1989)

42% (1990)

51% (1989)

40% (1986)

46% (1992)

47% (1987)

39% (1991)

39% (1990)

42% (1992)