82% (1992)

71% (1994)

61% (1997)

70% (1996)

64% (1992)

63% (1993)

60% (1996)

62% (1993)

65% (1994)

67% (1992)

49% (1994)

52% (1998)

66% (1992)

64% (1997)

40% (1998)

67% (1997)

61% (1996)

52% (1996)

39% (1994)

48% (1995)