27% (1988)

46% (1987)

42% (1990)

49% (1987)

40% (1991)

36% (1992)

48% (1989)

20% (1991)

20% (1991)

35% (1988)

63% (1989)

45% (1990)

50% (1991)

32% (1990)

28% (1989)

33% (1989)

29% (1988)

46% (1986)

37% (1989)

38% (1992)