april 1980

april 1980: 172 companies

2. april 1980 8 companies

3. april 1980 9 companies

8. april 1980 3 companies

9. april 1980 11 companies

10. april 1980 7 companies

11. april 1980 6 companies

12. april 1980 5 companies

14. april 1980 7 companies

15. april 1980 12 companies

16. april 1980 3 companies

17. april 1980 11 companies

18. april 1980 12 companies

19. april 1980 8 companies

21. april 1980 11 companies

22. april 1980 9 companies

23. april 1980 5 companies

24. april 1980 8 companies

25. april 1980 8 companies

26. april 1980 5 companies

28. april 1980 10 companies

29. april 1980 5 companies

30. april 1980 9 companies