75% (2011)

63% (2012)

67% (2010)

70% (2010)

73% (2010)

60% (2012)

58% (2009)

58% (2012)

55% (2009)

67% (2009)

71% (2013)

66% (2009)

60% (2010)

60% (2008)

63% (2009)

66% (2011)

61% (2011)

57% (2011)

67% (2011)

47% (2011)