My Cobblestone data is particulalry out of date and so likely to be an under estimate, and they are up against the bigger fish in this figure. The scale is as should in copies sold (not money).
I am waiting to see just how much trouble getting publisher-specific will get me into.
I can only add those for whom I have enough data. So kudos to those listed so far who all have at least 5 authors who feel able to share their data. A good sign of an open and transperant company, if you ask me. At this stage even these data sets are small enough to be quite wide of the real average.