If you have the data, that's great. Is there really value in that though? Markets have changed so much, especially with the rise of index funds and etfs and suc

If you have the data, that's great. Is there really value in that though? Markets have changed so much, especially with the rise of index funds and etfs and such. I couldn't imagine much value going back to pre WWII, or even before 1970. I would be satisfied if Q went back to the early 80s