I was thinking the same thing.
68 000 publishers = 4.5 each month or 54 that year.
1971 there where around 23 000 publishers which would be around 1.5 each month or 18 that year.
54+18=72
72*22=1584
So since 1971 (44 years) there should have been around 1584 phone calls regarding this issue to the legal department. (if the number is consistent and if the requirement to contact the legal department had been in place)