60% (1997)

64% (1990)

67% (1992)

56% (1996)

62% (1990)

62% (1991)

68% (1988)

55% (1993)

47% (1995)

41% (1990)

43% (1995)

43% (1990)

52% (1989)

25% (1991)

30% (1992)

25% (1996)

45% (1988)

50% (1996)

46% (1998)

72% (1996)