67% (2011)

57% (2008)

64% (2009)

73% (2006)

63% (2010)

69% (2004)

76% (2010)

65% (2009)

71% (2009)

67% (2008)

59% (2008)

71% (2007)

70% (2010)

52% (2006)

67% (2007)

56% (2006)

59% (2010)

64% (2007)

60% (2010)

55% (2011)