81% (2018)

62% (2004)

45% (1993)

71% (2000)

49% (2014)

72% (2011)

78% (2009)

74% (1998)

70% (2001)

78% (1988)

74% (2007)

66% (2012)

67% (2003)

65% (2009)

67% (2012)

71% (2013)

67% (2015)

69% (2016)

74% (2013)

87% (2014)