60% (1989)

69% (1997)

80% (2003)

72% (1998)

65% (1996)

65% (1989)

56% (1990)

46% (1996)

66% (1992)

50% (2000)

68% (1996)

66% (1987)

45% (1995)

68% (1988)

63% (1998)

62% (1989)

63% (1998)

65% (1997)

80% (1987)

49% (1996)