77% (1988)

69% (1993)

72% (1983)

77% (1988)

64% (1983)

70% (1995)

68% (1989)

63% (1994)

76% (1995)

67% (1992)

65% (1991)

63% (1985)

70% (1988)

57% (1989)

69% (1991)

80% (1991)

68% (1983)

50% (1985)

67% (1996)

56% (1993)