79% (1996)

73% (1999)

79% (1998)

76% (1997)

77% (1996)

73% (1994)

68% (1994)

65% (1997)

73% (1985)

63% (1996)

70% (1995)

73% (1995)

72% (1998)

67% (1992)

62% (1997)

60% (1997)

74% (1995)

71% (1990)

71% (1999)

72% (1998)