69% (2014)

57% (1991)

87% (2007)

80% (2010)

71% (2008)

71% (1993)

75% (2011)

58% (1988)

86% (2005)

74% (2000)

76% (2013)

69% (2015)

78% (2008)

73% (1994)

71% (2012)

78% (1998)

70% (2013)

60% (1990)

71% (2006)

59% (1996)