78% (2001)

73% (2004)

63% (2007)

65% (2014)

70% (2005)

67% (2012)

64% (2007)

70% (2010)

66% (2008)

62% (1998)

68% (2014)

65% (2009)

67% (2010)

69% (2005)

60% (2004)

64% (2001)

64% (2004)

63% (2014)

62% (2000)

55% (1991)