70% (2000)

54% (1996)

69% (1987)

65% (1996)

41% (2000)

60% (1997)

70% (1995)

43% (1999)

53% (1997)

48% (1998)

55% (2000)

63% (2000)

56% (1998)

44% (2000)

46% (1994)

50% (1998)

60% (1994)

40% (1998)

43% (1995)

49% (1995)