74% (1992)

76% (1997)

74% (1993)

64% (2009)

77% (1997)

68% (1994)

71% (1997)

63% (1993)

77% (1998)

75% (1996)

57% (2004)

65% (1993)

71% (1991)

68% (1995)

78% (1995)

64% (2010)

74% (1994)

56% (1994)

60% (1998)

53% (1997)