59% (2010)

67% (2007)

69% (2009)

65% (2010)

64% (2012)

59% (2012)

70% (2010)

68% (2009)

63% (2010)

64% (2008)

66% (2009)

57% (2011)

73% (2008)

57% (2008)

68% (2011)

63% (2012)

60% (2011)

60% (2010)

72% (2013)

60% (2009)