This is the yearly stats published by staff of Stack Overflow. It seems that there has been some interest about the health of the site and its determinants. This table focuses on moderation actions, like closing questions, deleting, reviewing, editing, etc.
The highlights considering what the conversation usually is about when referring to "moderators" actions:
* There's a process that deletes posts that are old and haven't seen a single positive interaction [1]. This is the biggest responsible for deletion of post for the site. Then users, then elected moderators. In that order.
* Authors are the ones that most close questions. This is due a mechanic [2] that allows authors to accept a suggestion that their question is a duplicate. Non-authors and moderators represent a relatively small part (~15%) of all closures of questions on the site.
* There are certain actions that only elected moderators can do and no amount of coordination by users are capable of, because of their sensible nature [3], those are the special attributes of moderators. Anything else most users can accomplish them.
[1]: https://meta.stackexchange.com/a/92006/213575
[2]: https://meta.stackexchange.com/a/250930/213575
[3]: https://meta.stackexchange.com/a/75192/213575
