Yeah, Flash Player is a free product. There's definitely a business model, but I'll leave that for you to research for your project. I have a general policy of not helping people do their homework in this venue (although it's usually someone asking for help on their programming project).
In this instance, I don't know that Adobe would publish data publicly with that level of granularity for public consumption. You're asking in a user-to-user forum for technical issues, so probably not the venue where you'd find business experts anyway. If the data isn't already published in a public report, it's not something that we would be able to provide. Our public corporate reports and filings are probably what you would need to look at for your research. Your professor may have some recommendations on where to start on that front.
There's a lot of stuff on the web detailing the history of Flash Player that's easily discoverable through a google search, and Wikipedia is an obvious first place to start. Check the list of citations for authoritative sources, etc...
Good luck!