75% (2011)

67% (2010)

63% (2012)

60% (2012)

73% (2010)

60% (2010)

67% (2009)

61% (2011)

70% (2013)

57% (2011)

70% (2010)

62% (2009)

67% (2011)

66% (2009)

66% (2011)

59% (2008)

57% (2012)

54% (2009)

64% (2010)

47% (2011)