April 1981

April 1981: 234 companies

1 April 1981 56 companies

2 April 1981 14 companies

3 April 1981 7 companies

4 April 1981 2 companies

6 April 1981 12 companies

7 April 1981 8 companies

8 April 1981 8 companies

9 April 1981 7 companies

10 April 1981 7 companies

12 April 1981 1 companies

13 April 1981 4 companies

14 April 1981 11 companies

15 April 1981 14 companies

17 April 1981 1 companies

18 April 1981 2 companies

20 April 1981 2 companies

21 April 1981 2 companies

22 April 1981 3 companies

23 April 1981 8 companies

24 April 1981 6 companies

25 April 1981 3 companies

26 April 1981 1 companies

27 April 1981 9 companies

28 April 1981 10 companies

29 April 1981 6 companies

30 April 1981 30 companies