I don’t have data for that, but if you want to give it a shot, feel free, and tag me on it. I’d like to see it.
When you do this, you’re going to struggle with what to define as a “mass shooting.” When Everytown puts together their statistics, they count a kid in a mall shooting 3 people with a BB gun as a mass shooting, so they might not be the best data source. Others strip those numbers out, but still count gangland gunfights that involve 3 people as a mass shooting, which is a very different definition than the public generally accepts to be a mass shooting. Trying to get the data is very difficult, because the data itself has been subject to extremely complex and rather dirty manipulation by people who have a stake in what the outcomes of the analysis might be.