45% (1985)

20% (1986)

40% (1988)

20% (1985)

69% (1998)

20% (1998)

57% (1971)

45% (1998)

20% (1997)

30% (1993)

44% (1992)

49% (1994)

35% (1999)

42% (2002)

61% (1995)

52% (1988)

35% (1999)

50% (2002)

25% (1987)

44% (1989)