59% (2013)

55% (2012)

64% (2009)

59% (2008)

64% (2010)

71% (2008)

68% (2009)

54% (2009)

55% (2010)

68% (2013)

53% (2015)

65% (2011)

59% (2010)

60% (2011)

70% (2010)

59% (2012)

59% (2013)

58% (2012)

63% (2009)

66% (2010)