76% (1988)

70% (1995)

63% (1994)

70% (1993)

75% (1995)

57% (1993)

65% (1985)

72% (1986)

69% (1983)

72% (1983)

57% (1989)

68% (1989)

64% (1983)

81% (1991)

65% (1991)

67% (1992)

53% (1986)

77% (1988)

64% (1995)

42% (1994)