April 1980

April 1980: 1 155 companies

1. April 1980 65 companies

2. April 1980 87 companies

3. April 1980 57 companies

4. April 1980 1 companies

5. April 1980 30 companies

7. April 1980 57 companies

8. April 1980 43 companies

9. April 1980 57 companies

10. April 1980 18 companies

11. April 1980 31 companies

12. April 1980 22 companies

14. April 1980 87 companies

15. April 1980 35 companies

16. April 1980 39 companies

17. April 1980 50 companies

18. April 1980 44 companies

19. April 1980 23 companies

21. April 1980 42 companies

22. April 1980 47 companies

23. April 1980 56 companies

24. April 1980 52 companies

25. April 1980 38 companies

26. April 1980 43 companies

28. April 1980 43 companies

29. April 1980 52 companies

30. April 1980 36 companies