82% (1992)

70% (1994)

60% (1997)

63% (1992)

60% (1996)

63% (1993)

69% (1996)

62% (1993)

65% (1992)

65% (1994)

67% (1997)

48% (1994)

67% (1992)

49% (1995)

53% (1996)

61% (1996)

64% (1997)

44% (1994)

46% (1989)

41% (1994)