75% (1997)

75% (1999)

66% (1997)

73% (1995)

74% (1998)

65% (1993)

53% (1995)

67% (1998)

63% (1992)

57% (1997)

63% (1997)

55% (1999)

67% (1998)

62% (1993)

54% (1996)

54% (1998)

52% (1996)

50% (1996)

57% (1998)

52% (1997)