72% (2003)

62% (1996)

44% (2000)

62% (1998)

68% (2003)

50% (1999)

47% (2002)

56% (1997)

38% (2002)

52% (1994)

53% (1998)

65% (2003)

60% (2004)

53% (2001)

60% (1997)

56% (1997)

68% (1996)

61% (2000)

45% (1994)

30% (1997)