48% (1986)

59% (1986)

52% (1987)

57% (1990)

50% (1990)

53% (1988)

52% (1988)

49% (1987)

43% (1989)

36% (1991)

43% (1995)

45% (1985)

38% (1990)

40% (1994)

49% (1998)

52% (1988)

42% (1990)

51% (1989)

39% (1991)

50% (1986)