68% (2013)

74% (2012)

67% (2008)

63% (2013)

60% (2013)

57% (2012)

60% (2009)

44% (2006)

65% (2006)

52% (2012)

54% (2013)

51% (2011)

68% (2002)

58% (2006)

59% (2008)

53% (2008)

50% (2012)

53% (2005)

61% (2006)

46% (2005)