79% (1996)

73% (1999)

79% (1998)

76% (1997)

77% (1996)

73% (1994)

65% (1997)

68% (1994)

73% (1985)

73% (1995)

62% (1997)

71% (1994)

72% (1998)

74% (1995)

71% (1990)

67% (1992)

61% (1997)

72% (1998)

71% (1999)

61% (1997)