Running engagement pulse checks in Teams, how do you track trends over time?

My lead asked me to start doing monthly pulse checks across our team of 20. I've been using Forms and dropping the link in the channel. Response rate sits around 50% which I can live with, but the real problem is that every survey is its own isolated result set. I can see this month's numbers fine. Comparing them to three months ago means exporting everything to Excel and rebuilding the comparison by hand.