79% (1996)

61% (1994)

73% (1999)

79% (1998)

73% (1994)

76% (1997)

77% (1996)

68% (1994)

72% (1998)

73% (1985)

65% (1997)

73% (1995)

71% (1994)

71% (1990)

62% (1997)

66% (1992)

73% (1998)

69% (1993)

65% (1995)

70% (1999)