81% (1991)

70% (1992)

70% (1994)

77% (1991)

67% (1992)

74% (1993)

65% (1993)

64% (1992)

58% (1995)

78% (1999)

73% (1995)

64% (1993)

74% (1999)

75% (1991)

75% (1992)

72% (1995)

70% (1994)

64% (1995)

75% (1992)

67% (1993)