68% (2000)

45% (2000)

52% (2005)

69% (1998)

28% (2008)

51% (2008)

56% (2007)

35% (2000)

44% (2004)

40% (2006)

37% (2005)

54% (2000)

35% (2003)

47% (1997)

65% (1998)

56% (1998)

58% (1996)

59% (2002)

40% (2001)

40% (2002)