65% (1997)

61% (1994)

72% (1991)

64% (1998)

76% (1992)

48% (1997)

58% (1994)

56% (1992)

65% (1993)

59% (1991)

55% (1992)

63% (1998)

69% (1996)

55% (1997)

0% (1996)

71% (1991)

60% (1996)

63% (1996)

57% (1998)

63% (1992)