35% (1988)

40% (1982)

38% (1990)

52% (1989)

45% (1987)

47% (1986)

35% (1990)

15% (1991)

47% (1991)

73% (1991)

33% (1990)

45% (1990)

45% (1990)

55% (1990)

10% (1993)

25% (1992)

45% (1990)

50% (1992)