63% (1993)

65% (1989)

53% (1996)

75% (1994)

57% (1997)

45% (1996)

62% (1998)

68% (1989)

65% (1997)

80% (1997)

47% (1990)

54% (1998)

69% (1992)

68% (1996)

49% (1996)

68% (1988)

72% (1989)

62% (1994)

69% (1997)

64% (1994)