Some Data On Data Scientist Hiring

Most data available on Data Science hiring, salaries, how many Data Scientists there are right now, etc., is complete trash. I have had a few requests for data around hiring as well as questions about raises, salaries, and retention. This post started as a quick take and is long enough to release as an entire post, making the information easier to find. I will update this post as I find more data around Data Science hiring, supply, and demand.