36% (1988)

48% (1987)

34% (1987)

35% (1993)

27% (1988)

45% (1987)

37% (1989)

42% (1992)

35% (1992)

37% (1991)

32% (1992)

42% (1988)

33% (1990)

24% (1989)

46% (1986)

35% (1990)

23% (1991)

27% (1990)

48% (1989)

20% (1991)