69% (2015)

73% (2014)

79% (2013)

71% (1997)

68% (2015)

79% (2016)

65% (2004)

62% (2012)

70% (2011)

57% (2004)

76% (2007)

67% (2009)

58% (2016)

70% (2007)

70% (2005)

73% (2010)

10% (2007)

0% (2009)

20% (2003)

85% (1997)