80% (2010)

72% (2001)

76% (2013)

75% (2011)

71% (2012)

66% (2007)

57% (1988)

86% (2005)

71% (1993)

78% (1998)

74% (2004)

69% (2015)

68% (2010)

66% (1992)

69% (2014)

71% (2006)

72% (2008)

74% (2000)

69% (2009)

57% (1991)