See this LibAnswer: Where do I find industry statistics and reports? and search for  "video games" or "computer games".

Also try: 

• The Entertainment Software Association provides industry information and statistics on its website. Click the "industry facts" under the About ESA tab to see their "Essential Facts About the Computer and Video Game Industry” report. The ESA also publishes annual reports.

Some of these databases are reserved for University of Illinois faculty and student use for academic purposes only. To inquire further please contact: bis@library.illinois.edu