72% (2009)

64% (2004)

83% (2006)

75% (1990)

79% (1993)

76% (2006)

72% (2000)

70% (2001)

65% (2014)

69% (1998)

67% (1999)

69% (1992)

64% (2002)

68% (1997)

76% (1988)

62% (2011)

64% (1993)

71% (1997)

67% (2002)

77% (2002)