82% (1992)

71% (1994)

60% (1997)

63% (1992)

60% (1996)

69% (1996)

67% (1992)

64% (1997)

62% (1993)

65% (1992)

63% (1993)

48% (1994)

66% (1997)

49% (1995)

43% (1994)

65% (1994)

55% (1996)

41% (1994)

62% (1996)

52% (1998)