April 1980

April 1980: 238 companies

2. April 1980 3 companies

3. April 1980 1 companies

8. April 1980 12 companies

9. April 1980 14 companies

10. April 1980 29 companies

13. April 1980 18 companies

14. April 1980 5 companies

15. April 1980 7 companies

16. April 1980 6 companies

17. April 1980 17 companies

18. April 1980 8 companies

20. April 1980 6 companies

22. April 1980 8 companies

23. April 1980 15 companies

24. April 1980 10 companies

25. April 1980 6 companies

27. April 1980 22 companies

28. April 1980 32 companies

29. April 1980 4 companies

30. April 1980 15 companies