65% (1990)

60% (1995)

66% (1990)

54% (1992)

56% (1991)

44% (1994)

35% (1996)

52% (1987)

59% (1992)

41% (1994)

33% (1996)

43% (1995)

59% (1995)

49% (1998)

38% (1999)

41% (1993)

30% (1994)

58% (1993)

38% (1994)

32% (1994)