81% (1992)

70% (1994)

64% (1992)

60% (1997)

60% (1996)

63% (1993)

70% (1996)

66% (1992)

66% (1997)

65% (1994)

62% (1993)

48% (1994)

66% (1992)

62% (1996)

64% (1997)

43% (1994)

41% (1994)

48% (1995)

40% (1997)

55% (1996)