79% (1998)

79% (1996)

62% (1994)

73% (1999)

77% (1996)

73% (1994)

76% (1997)

65% (1997)

72% (1998)

68% (1994)

73% (1985)

73% (1998)

71% (1994)

71% (1999)

66% (1992)

70% (1990)

59% (1998)

73% (1995)

41% (1996)

61% (1997)