28% (2000)

10% (1996)

60% (1999)

46% (1995)

55% (2001)

50% (1997)

35% (2003)

46% (1993)

30% (1998)

37% (1996)

25% (1997)

45% (1994)

32% (1998)

42% (1995)

50% (1995)