76% (1997)

74% (1993)

74% (1992)

68% (1994)

53% (1997)

77% (1997)

71% (1997)

49% (1994)

63% (1993)

57% (2004)

71% (1991)

77% (1998)

64% (2009)

62% (1996)

65% (1993)

59% (1995)

63% (1993)

77% (1995)

68% (1995)

76% (1996)