76% (1988)

70% (1993)

57% (1993)

70% (1995)

65% (1985)

63% (1994)

42% (1994)

77% (1988)

69% (1983)

75% (1995)

64% (1983)

72% (1986)

62% (1985)

68% (1989)

65% (1991)

72% (1983)

67% (1992)

57% (1989)

53% (1986)

69% (1991)