AFAIU HN's posting system strips URL parameters.

If they're significant to your post you can email the mods at [email protected] to restore them.

You might also want to write a top-level comment clarifying what you find significant about the URL and/or specific query.

The 2020, 2021 dip looks fishy, I would hypothize this is related to the pandemic lockdowns and overburdened hospitals reducing the number of cancer diagnoses. But it's a hypothesis that would need to be confirmed with the relevant numbers.