81% (1992)

70% (1994)

63% (1992)

60% (1997)

62% (1993)

60% (1996)

62% (1993)

69% (1996)

41% (1994)

48% (1994)

65% (1992)

66% (1997)

55% (1996)

66% (1992)

62% (1996)

64% (1994)

43% (1994)

46% (1989)

64% (1997)

52% (1998)