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