83% (2006)

75% (1990)

76% (2006)

79% (1993)

72% (2009)

70% (2001)

69% (1998)

68% (1997)

71% (1997)

72% (2000)

65% (2014)

69% (1992)

76% (1988)

74% (2000)

64% (2002)

77% (2002)

65% (2000)

63% (2004)

65% (1996)

69% (2006)