30% (1993)

42% (1995)

24% (1995)

65% (1995)

68% (1995)

60% (1997)

45% (1994)

44% (1997)

42% (2000)

60% (1991)

35% (1996)

30% (1994)

20% (1989)

63% (1999)

25% (1984)

10% (1990)

45% (1992)

58% (1994)

30% (1997)

50% (1990)