84% (1989)

82% (1992)

71% (1993)

66% (1996)

62% (1987)

75% (1999)

72% (1998)

70% (1997)

73% (1995)

73% (1994)

82% (1994)

72% (1998)

50% (1989)

72% (1998)

71% (1989)

78% (1999)

65% (1996)

77% (1994)

77% (1998)

73% (1987)