69% (2010)

62% (2011)

64% (2013)

58% (2013)

60% (2008)

63% (2012)

61% (2014)

67% (2008)

66% (2008)

59% (2006)

59% (2009)

77% (2008)

67% (2007)

57% (2008)

62% (2011)

59% (2013)

70% (2006)

73% (2007)

67% (2008)

59% (2010)