77% (1996)

65% (1997)

62% (1997)

65% (1995)

59% (1996)

61% (1998)

65% (1996)

62% (1996)

65% (1997)

70% (1996)

69% (1996)

62% (1995)

53% (1996)

53% (1997)

60% (1997)

61% (1996)

53% (1997)

59% (1996)

55% (1996)

72% (1994)