79% (1996)

79% (1998)

73% (1999)

76% (1997)

73% (1994)

77% (1996)

73% (1985)

65% (1997)

68% (1994)

62% (1997)

73% (1995)

72% (1998)

71% (1990)

61% (1997)

67% (1992)

72% (1998)

60% (1997)

59% (1998)

71% (1994)

74% (1995)