Er, daunting task falls to lone gamer in the office…
Halp!
How would one go about determining this? World wide, all markets. Sheer numbers are mildy useful, but we really need to compile a database by publisher, title, platform, region, composer and year released.
If you were willing to assume that Moby Games is relatively accurate, you can look at the total entries per year (which looks to be slightly over a thousand):