58% (1991)

39% (1988)

42% (1990)

32% (1993)

42% (1997)

45% (1994)

10% (1998)

45% (1989)

33% (1990)

36% (1992)

37% (1998)

10% (1993)

34% (1995)

21% (1992)

16% (2000)

21% (1989)

27% (1991)

10% (1995)

39% (1990)

40% (1990)