57% (2008)

67% (2011)

63% (2010)

64% (2009)

69% (2004)

59% (2010)

72% (2009)

61% (2011)

76% (2010)

65% (2009)

60% (2010)

56% (2006)

67% (2008)

64% (2004)

60% (2011)

65% (2010)

55% (2011)

45% (2009)

60% (2010)

50% (2008)