40% (1998)

70% (2000)

54% (1998)

30% (1999)

41% (2000)

60% (1996)

65% (1996)

42% (1995)

58% (1995)

51% (1997)

70% (1987)

43% (1999)

55% (2000)

63% (1996)

49% (1998)

38% (1994)

49% (1995)

52% (1996)

44% (1995)

40% (2000)