OK, it took some searching but I think I found some decent numbers for the actual number of people subscribed to Verizon in Q1 2013. Their numbers for Q1 2014 shouldn't be too different because of raises and drops in subscriber numbers during the year (they had a weak Q1 in 2014).
It looks like as of Q1 2013 Verizon's numbers were 98.9 million users for wireless and 188,000 on FIOS Internet.
Counting phone and IP makes the total 99,088,000. That means another possible equation to look at is 150,000/99,088,000 = 0.0015 or 0.15% of Verizon subscribers which had requests for data made against them.
Again, it's still a small percentage, but this is the population that was involved in the request. Another thing to remember is that some of those requests may be multiple requests on multiple phones or computers for just one person.