Instance admins, how much does it cost you to run your instance? How much does that represent per active user?

Question triggered by the other post about instances shutting down due to costs

Summary of the answers:

• lowest number so far: lemmy.ml with 0.03€ per user per month
• a few others (feddit.uk, lemmy.zip) have around 0.11$ per user per month
• obviously single user instance have higher costs