75% (1997)

73% (1995)

66% (1997)

75% (1999)

54% (1995)

74% (1998)

67% (1998)

54% (1996)

65% (1993)

63% (1997)

67% (1998)

63% (1992)

57% (1997)

55% (1999)

61% (1993)

59% (1996)

50% (1996)

52% (1996)

76% (1994)

55% (1997)