64% (2009)

63% (2013)

71% (2007)

60% (2010)

63% (2009)

62% (2008)

62% (2008)

72% (2011)

63% (2010)

62% (2012)

63% (2008)

59% (2009)

73% (2006)

62% (2008)

68% (2009)

57% (2007)

59% (2011)

61% (2011)

63% (2012)

66% (2012)