71% (1994)

82% (1992)

60% (1997)

64% (1992)

69% (1996)

60% (1996)

62% (1993)

63% (1993)

65% (1994)

67% (1992)

48% (1994)

66% (1997)

66% (1992)

44% (1994)

64% (1997)

61% (1996)

52% (1998)

46% (1989)

53% (1996)

41% (1994)