73% (1999)

79% (1996)

78% (1998)

76% (1997)

66% (1994)

72% (1985)

76% (1996)

65% (1997)

72% (1998)

71% (1990)

68% (1994)

73% (1994)

60% (1997)

61% (1997)

64% (1995)

73% (1999)

73% (1995)

72% (1998)

59% (1993)

70% (1995)