17% (1999)

58% (1996)

34% (2000)

40% (1992)

61% (1999)

30% (1994)

60% (1996)

45% (1995)

70% (1990)

28% (1999)

35% (1993)

45% (1992)

50% (2001)

45% (2001)

30% (1994)

51% (1994)

44% (1992)

32% (1999)

38% (1998)

58% (1994)