67% (2007)

78% (2010)

70% (2007)

76% (2011)

62% (2012)

69% (2011)

75% (2006)

71% (2006)

60% (2004)

64% (2009)

70% (2005)

59% (2011)

72% (2009)

63% (2010)

59% (2007)

65% (2009)

56% (2005)

68% (2004)

65% (2004)

65% (2011)