40% (2006)

56% (2007)

70% (1998)

68% (2000)

44% (2000)

29% (2008)

51% (2005)

52% (2000)

58% (2001)

56% (1998)

40% (2001)

43% (2004)

15% (1997)

39% (2002)

53% (2004)

58% (2006)

57% (1996)

41% (2000)

46% (2005)

25% (2003)