a source that records this type of information requires a people to provide legal proof that they're breaking the law as well as providing evidence that opens them up legal & financial liability; but i'm sure you knew that and asked for a source anyways knowing that it's impossible in order to shut down a counter argument and help support your point.
the closest thing you can get to it are surveys done by pollsters and that's private information and is only shared to subscribers who are sometimes also journalists who write articles that sometimes shared it on reddit; where i learned of it from; and i wouldn't be surprised if you knew that too.
nevermind