80% (1999)

72% (1996)

76% (1993)

82% (1993)

58% (1994)

70% (1995)

59% (1995)

72% (1995)

69% (1992)

65% (1997)

62% (1998)

62% (1992)

63% (1996)

71% (1995)

45% (1993)

70% (1995)

67% (1995)

54% (1996)

65% (1994)

61% (1996)