april 1981

april 1981: 1 637 companies

1. april 1981 641 companies

2. april 1981 32 companies

3. april 1981 29 companies

4. april 1981 19 companies

5. april 1981 3 companies

6. april 1981 9 companies

7. april 1981 50 companies

8. april 1981 21 companies

9. april 1981 38 companies

10. april 1981 76 companies

11. april 1981 20 companies

12. april 1981 5 companies

13. april 1981 28 companies

14. april 1981 47 companies

15. april 1981 73 companies

16. april 1981 54 companies

17. april 1981 43 companies

18. april 1981 25 companies

19. april 1981 3 companies

20. april 1981 75 companies

21. april 1981 41 companies

22. april 1981 32 companies

23. april 1981 45 companies

24. april 1981 37 companies

25. april 1981 36 companies

26. april 1981 7 companies

27. april 1981 41 companies

28. april 1981 46 companies

29. april 1981 17 companies

30. april 1981 44 companies