79% (1996)

73% (1999)

76% (1997)

79% (1998)

68% (1994)

65% (1997)

77% (1996)

73% (1985)

72% (1998)

73% (1995)

72% (1998)

71% (1990)

67% (1992)

73% (1994)

71% (1999)

61% (1997)

63% (1998)

74% (1995)

60% (1997)

65% (1995)