76% (2011)

66% (2007)

61% (2012)

69% (2011)

70% (2007)

75% (2006)

60% (2009)

62% (2010)

64% (2009)

55% (2005)

65% (2009)

59% (2007)

54% (2005)

70% (2005)

74% (2002)

63% (2001)

71% (2005)

72% (2009)

65% (2011)

64% (2011)