77% (1996)

66% (1997)

65% (1995)

66% (1996)

59% (1996)

70% (1996)

61% (1997)

61% (1997)

63% (1996)

62% (1998)

54% (1997)

65% (1997)

69% (1996)

52% (1995)

61% (1996)

35% (1995)

55% (1996)

62% (1995)

52% (1997)

60% (1996)