82% (1992)

71% (1994)

70% (1996)

63% (1993)

61% (1997)

63% (1992)

62% (1993)

67% (1992)

52% (1998)

49% (1994)

60% (1996)

64% (1997)

40% (1998)

65% (1994)

51% (1996)

61% (1996)

39% (1994)

44% (1994)

66% (1992)

50% (1993)