74% (1995)

67% (1988)

72% (1998)

47% (1989)

77% (1988)

57% (1997)

45% (1996)

54% (1998)

53% (1998)

62% (1996)

72% (1988)

63% (1990)

64% (1996)

68% (1996)

65% (1988)

68% (1992)

54% (1988)

78% (1997)

63% (1993)

68% (1989)