Hello Mr. Dwyer.
I found the stock market traded on every year on FRED. You can use it for your study. I'm working on a paper concerning the stock market: How it works from an engineer sight and how it will work on a economy in which supply and demand are matched to avoid business cycles. I have realized that when the stock market traded is about 1 trillion the stock market capitalization increases 1000 points (more or less). So, having in consideration that you were who gave me the idea of volume of stock traded and market capitalization, I would like to receive your help in a small section of my paper in which you can explain your insight about the issue. Contact me if you are interested, if not I promise to just touch the matter very slightly only if necessary.