April 1980

April 1980: 1 599 companies

1. April 1980 112 companies

2. April 1980 49 companies

3. April 1980 89 companies

4. April 1980 1 companies

8. April 1980 135 companies

9. April 1980 62 companies

10. April 1980 50 companies

11. April 1980 78 companies

13. April 1980 2 companies

14. April 1980 117 companies

15. April 1980 67 companies

16. April 1980 43 companies

17. April 1980 49 companies

18. April 1980 81 companies

21. April 1980 131 companies

22. April 1980 60 companies

23. April 1980 104 companies

24. April 1980 88 companies

25. April 1980 63 companies

26. April 1980 1 companies

28. April 1980 72 companies

29. April 1980 78 companies

30. April 1980 67 companies