74% (1992)

64% (2009)

76% (1997)

74% (1993)

77% (1997)

63% (1993)

78% (1995)

77% (1998)

68% (1994)

76% (1996)

57% (2004)

71% (1997)

71% (1991)

65% (1993)

64% (2010)

54% (1994)

57% (1994)

69% (1995)

74% (1994)

63% (1996)