95% (1994)

71% (1998)

80% (1993)

80% (1995)

82% (1992)

70% (1990)

77% (1989)

85% (1992)

83% (1994)

64% (1990)

74% (1991)

69% (1992)

71% (1998)

71% (1993)

74% (1994)

70% (1991)

64% (1996)

68% (1994)

57% (1998)

74% (1995)