april 1981

april 1981: 1 667 companies

1. april 1981 87 companies

2. april 1981 57 companies

3. april 1981 33 companies

4. april 1981 51 companies

6. april 1981 79 companies

7. april 1981 74 companies

8. april 1981 62 companies

9. april 1981 68 companies

10. april 1981 53 companies

11. april 1981 91 companies

13. april 1981 43 companies

14. april 1981 66 companies

15. april 1981 99 companies

16. april 1981 25 companies

17. april 1981 1 companies

18. april 1981 66 companies

19. april 1981 1 companies

20. april 1981 78 companies

21. april 1981 70 companies

22. april 1981 62 companies

23. april 1981 75 companies

24. april 1981 70 companies

25. april 1981 67 companies

27. april 1981 74 companies

28. april 1981 72 companies

29. april 1981 84 companies

30. april 1981 59 companies