I don't think that's a valid metric at all. This doesn't reflect the quality of censored expressions, their factual validity (mere facts are not opinions) or evolutionary adaptations to the discourse, like deflection ("No u!"). You assume a zero sum game.
See how diversity initiatives and co are confronted with "this is racism against white people!". Does this reflect an increase in discrimination against "white" people, or an decrease in discrimination for "non-white" people?
Then, people getting kicked off a Platform for being mean and abusive, doesn't mean they got censored for their political views, even if they claim that's the case.
All, I am saying is, your metric is problematic.