70% (2011)

66% (2007)

72% (2009)

52% (2006)

62% (2012)

70% (2007)

56% (2005)

60% (2004)

62% (2010)

75% (2006)

65% (2009)

76% (2011)

61% (2008)

70% (2005)

60% (2009)

64% (2009)

70% (2004)

64% (2011)

57% (2010)

59% (2010)