82% (1991)

71% (1994)

69% (1992)

74% (1993)

66% (1993)

76% (1991)

67% (1992)

78% (1999)

64% (1992)

73% (1995)

74% (1999)

58% (1995)

64% (1993)

74% (1992)

67% (1993)

70% (1994)

64% (1995)

72% (1995)

75% (1991)

74% (1993)