70% (1994)

82% (1992)

60% (1996)

60% (1997)

48% (1994)

66% (1997)

65% (1992)

63% (1992)

63% (1993)

43% (1994)

69% (1996)

48% (1995)

62% (1993)

67% (1992)

64% (1997)

65% (1994)

62% (1996)

42% (1993)

55% (1996)

41% (1994)