50% (1994)

50% (1995)

60% (1991)

60% (1989)

56% (1996)

67% (1997)

50% (1991)

39% (1994)

48% (1993)

62% (1989)

30% (1991)

45% (1996)

41% (1989)

35% (1994)

37% (1991)

43% (1994)

10% (1993)

72% (1994)

32% (1991)

66% (1993)