50% (1985)

69% (1984)

50% (1988)

52% (1985)

55% (1986)

50% (1981)

48% (1987)

60% (1981)

49% (1987)

70% (1987)

47% (1987)

87% (1988)

35% (1986)

60% (1986)

58% (1984)

30% (1981)