76% (1997)

74% (1993)

74% (1992)

77% (1997)

64% (2009)

71% (1991)

70% (1997)

77% (1998)

68% (1994)

76% (1996)

57% (2004)

65% (1993)

74% (1994)

68% (1995)

53% (2003)

63% (1996)

62% (1993)

59% (1995)

58% (2009)

53% (1997)