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