When the Rams play marquee teams like the Packers, Cowboys, Steelers, 49ers, Chiefs, etc. that travel well everywhere (not just to LA) they'll have a lot of visitors. But vs. most teams (this year the the Falcons, Cardinals, Panthers, Chargers, etc.) it will be 90% Rams fans.

Plus let's not forget that when the Rams go to Arizona, San Francisco, etc. there are large contingents of Rams fans there. So it goes both ways to some degree.