76% (1997)

74% (1992)

74% (1993)

77% (1997)

71% (1997)

64% (2009)

68% (1994)

65% (1993)

63% (1993)

71% (1991)

77% (1998)

78% (1995)

57% (2004)

68% (1995)

53% (1997)

64% (2010)

53% (2003)

76% (1996)

74% (1994)

59% (1995)