70% (2000)

51% (1990)

65% (1996)

70% (1987)

43% (1999)

40% (1998)

51% (1997)

52% (1996)

42% (1995)

49% (1998)

60% (1996)

31% (1999)

54% (1998)

50% (2001)

30% (1999)

57% (2000)

50% (1997)

41% (2000)

44% (1995)

57% (1998)