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