77% (1996)

73% (1999)

79% (1996)

76% (1997)

79% (1998)

72% (1985)

65% (1997)

72% (1998)

60% (1997)

68% (1994)

75% (1999)

60% (1997)

73% (1998)

66% (1992)

60% (1993)

59% (1998)

65% (1995)

73% (1994)

72% (1995)

40% (1996)