76% (2011)

62% (2012)

67% (2007)

70% (2007)

71% (2004)

69% (2011)

64% (2009)

60% (2004)

75% (2006)

70% (2005)

60% (2009)

71% (2006)

63% (2001)

62% (2010)

76% (2003)

65% (2009)

65% (2012)

70% (2011)

70% (2010)

59% (2007)