75% (1990)

83% (2006)

72% (2009)

76% (2006)

78% (1993)

68% (1998)

69% (2001)

69% (1992)

71% (1997)

77% (2002)

65% (2014)

67% (1997)

71% (1997)

69% (2006)

72% (2000)

62% (2011)

71% (1998)

64% (2002)

73% (2002)

64% (2000)