Because it's an extended period, with a simple round time window that doesn't include the IPO pop from the frothiest IPO environment of the last decade. Happy to have gone with any time window outside of 2021. That should be clear from my comment.

"But, Creddit", the ignorant accuser of cherry-picking whine, "why after 2021?"

Because as anyone in tech knows, that was the frothiest IPO environment of the last decade. Source for those who aren't aware: https://site.warrington.ufl.edu/ritter/files/IPOs-Tech.pdf