76% (1988)

76% (1995)

70% (1993)

64% (1983)

56% (1993)

77% (1988)

70% (1995)

68% (1989)

64% (1991)

56% (1986)

67% (1992)

72% (1983)

63% (1994)

63% (1985)

80% (1991)

50% (1985)

68% (1983)

55% (1984)

68% (1991)

40% (1994)