28% (2008)

53% (2000)

68% (2000)

70% (1998)

46% (2000)

57% (2002)

40% (2001)

39% (2002)

40% (2002)

40% (2004)

65% (1998)

55% (2007)

35% (2000)

53% (2005)

58% (2001)

51% (2008)

46% (1997)

56% (2007)

46% (2005)

44% (2004)