april 1980

april 1980: 889 companies

1. april 1980 23 companies

2. april 1980 33 companies

3. april 1980 35 companies

8. april 1980 13 companies

9. april 1980 47 companies

10. april 1980 38 companies

11. april 1980 74 companies

14. april 1980 51 companies

15. april 1980 48 companies

16. april 1980 54 companies

17. april 1980 47 companies

18. april 1980 36 companies

21. april 1980 48 companies

22. april 1980 63 companies

23. april 1980 53 companies

24. april 1980 61 companies

28. april 1980 40 companies

29. april 1980 64 companies

30. april 1980 61 companies