75% (2011)

67% (2010)

63% (2012)

70% (2010)

61% (2012)

73% (2010)

58% (2011)

67% (2009)

70% (2013)

63% (2009)

60% (2010)

66% (2009)

59% (2008)

67% (2011)

58% (2012)

67% (2011)

61% (2011)

64% (2010)

54% (2009)

58% (2009)