62% (1986)

71% (1988)

46% (1987)

65% (1987)

50% (1971)

69% (1987)

68% (1989)

56% (1986)

63% (1985)

60% (1986)

55% (1988)

58% (1987)

57% (1989)

49% (1989)

70% (1985)

64% (1983)

60% (1985)

55% (1990)

59% (1984)

35% (1986)