77% (1996)

65% (1996)

65% (1997)

65% (1995)

59% (1996)

61% (1998)

61% (1997)

70% (1996)

61% (1996)

69% (1997)

53% (1997)

53% (1996)

62% (1996)

64% (1997)

60% (1997)

63% (1995)

58% (1996)

53% (1997)

34% (1997)

52% (1995)