66% (2011)

57% (2008)

60% (2010)

64% (2009)

63% (2010)

65% (2009)

67% (2008)

72% (2006)

76% (2010)

69% (2004)

67% (2008)

55% (2011)

59% (2010)

72% (2009)

67% (2007)

73% (2009)

59% (2008)

60% (2011)

67% (2011)

56% (2006)