80% (1996)

68% (1994)

69% (1998)

70% (1995)

70% (1997)

73% (1993)

72% (1998)

74% (1996)

66% (1999)

76% (1996)

67% (1985)

70% (1990)

62% (1998)

73% (1992)

62% (1994)

90% (1984)

65% (1989)

57% (1993)

74% (1990)

70% (1990)