How to control the marketshare of a custom console using UME?

I’m trying to use UME to make a mod that adds a LOT of stuff to the game, and i’m adding a lot of real-life consoles as well. However, i don’t know how to control the marketshare of them. I added the Atari 5200( with a modified name and picture obviously) to the game, and i want to make it flop when the NES/TES is released, however i don’t know how to do that.

I know that you can set how many units the console sell initially and when it’s retired from the market, but i don’t know how many units the TES sold in the game. Is there a way to help me here?

OBS: Sorry for possible bad english, english is not my first language.

UME is broken, use the UltimateModMaker, BeamModMaker or code your mod in JavaScript