35% (1993)

36% (1988)

48% (1987)

48% (1989)

45% (1987)

37% (1991)

27% (1988)

37% (1989)

23% (1991)

42% (1988)

34% (1987)

35% (1992)

33% (1990)

45% (1990)

38% (1989)

42% (1992)

20% (1991)

41% (1990)

21% (1989)

38% (1989)