Scientific output of researchers in industry and academia
Disclaimer: this answer applies to computer science. I suspect things are dramatically different in the natural sciences.

It's hard to measure these things, and a bit unfair. If you work as a professor, publications are the base unit (along with funding) for measuring your performance as a researcher. You also are encouraged to grow research groups that in turn will produce more and more papers.

If you work in industry (even industrial research labs) (and I've done both), you are evaluated not just in terms of paper output, but in terms of internal metrics relating to how you help the company. 

So the incentive structure in industry is different. 

Bottom line, since I haven't really answered the question: I expect that the average number of publications/researcher will be slightly less in industry than in academia, but the average will get closer as the lab characteristics become more "university-like": think MSR vs (say) Walmart Labs.