67% (2011)

64% (2009)

57% (2008)

63% (2010)

76% (2010)

64% (2007)

69% (2004)

72% (2009)

67% (2007)

61% (2011)

65% (2009)

60% (2010)

67% (2008)

60% (2010)

56% (2006)

60% (2011)

59% (2010)

59% (2008)

55% (2011)

70% (2010)