76% (1997)

52% (1994)

0% (1996)

64% (1995)

59% (1996)

0% (1995)

45% (1994)

66% (1995)

32% (1994)

51% (1995)

56% (1994)

58% (1994)

63% (1994)

57% (1995)

20% (1994)

51% (1993)

37% (1996)

10% (1997)

69% (1993)

72% (1998)