Pokemon price history?

I have heard of this:

It would be wonderful if a robust source of price points going back several years were spreadsheeted for everyone to see.

I can’t imagine how someone could conclude that the growth in the market for Pokemon cards since 2016 is healthy, sustainable, or lasting without relying on the kind of data you’ve requested. Could anyone who believes that share what data you rely on or how you arrive at your conclusion?

This was an excellent question, in my opinion, Skiwi!