67% (2011)

57% (2008)

64% (2009)

63% (2010)

65% (2009)

67% (2008)

73% (2006)

53% (2006)

72% (2009)

76% (2010)

72% (2009)

67% (2007)

59% (2010)

45% (2009)

60% (2010)

70% (2010)

67% (2011)

67% (2010)

69% (2004)

68% (2008)