74% (1993)

76% (1997)

64% (2010)

71% (1997)

57% (2004)

77% (1997)

71% (1991)

78% (1995)

63% (1993)

64% (2009)

58% (2009)

77% (1998)

63% (1993)

68% (1994)

64% (1991)

74% (1994)

75% (1996)

65% (1993)

69% (1995)

53% (2003)