68% (2011)

65% (2010)

67% (2008)

61% (2010)

60% (2011)

59% (2014)

63% (2012)

52% (2009)

73% (2013)

55% (2009)

63% (2012)

67% (2008)

65% (2007)

59% (2009)

57% (2011)

69% (2008)

68% (2007)

75% (2014)

62% (2014)

62% (2011)