They have the data, all they would have to do it search it. Seems to me they could take say the 500 most common names (Stan Lee, McFarlane, Kirkman etc) and run searches on the notes section of all past books and come up with a number to start. That would take a computer programmer about 15 mins of time. And boom there is a start to a census. Then they could just run other names as a new one came through. For instance a new Arnold book comes through, you run a search of all past books with Arnold's name in the notes and out comes a number. Sure it might take a couple of years to get it to be complete but it is better than what we have now.