21% (1989)

41% (1990)

41% (1988)

30% (1992)

32% (1990)

45% (1990)

34% (1987)

32% (1992)

29% (1988)

43% (1991)

63% (1989)

38% (1989)

34% (1992)

30% (1990)

20% (1991)

50% (1991)

37% (1989)

35% (1990)