77% (1996)

66% (1997)

65% (1995)

62% (1997)

59% (1996)

61% (1998)

54% (1997)

65% (1997)

62% (1996)

70% (1996)

65% (1996)

54% (1996)

55% (1996)

69% (1996)

59% (1996)

60% (1997)

62% (1995)

60% (1996)

52% (1995)

61% (1997)