72% (2010)

62% (2008)

65% (2009)

60% (2010)

63% (2013)

63% (2009)

63% (2008)

71% (2007)

62% (2008)

62% (2008)

63% (2010)

66% (2012)

72% (2011)

67% (2009)

61% (2012)

63% (2012)

65% (2008)

73% (2006)

54% (2007)

60% (2011)