Average number of software patents per engineer/firm?

Hi,I’m really interested in the whole SW patenting debate, and trying to research a little for my firm (a software company) on it. I was wondering if anyone knew how many software patents were being filed on average per firm?I guess the datapoint would be something the average number of software patents per employee or engineer in software companies.Does that make sense - just trying to get a handle on how much a typical company is expecting to file.?Thanks for any help!!!