35% (1993)

36% (1988)

27% (1988)

49% (1987)

36% (1989)

36% (1990)

32% (1992)

35% (1992)

24% (1989)

37% (1991)

33% (1990)

23% (1991)

46% (1986)

41% (1990)

20% (1991)

34% (1987)

30% (1992)

27% (1990)

28% (1989)

45% (1990)