76% (1997)

68% (1994)

74% (1992)

74% (1993)

71% (1991)

71% (1997)

63% (1996)

77% (1998)

77% (1997)

53% (1997)

76% (1996)

74% (1994)

68% (1995)

62% (1993)

64% (2009)

57% (2004)

65% (1993)

64% (1991)

58% (2009)

48% (1994)