Report(s) of users trust level promotions?

I want to be able to notice when users are promoted to a new trust level. Is there any place where I can see a list of trust level promotions? Or a user-list that I can sort by date-of-promotion?

This section of my admin dashboard, leads me to a tidy report for each user level. If I could also see-and-sort-by each user’s date-of-promotion, that would get me what I want.

update: ooooooh, I think if I look at the corresponding group for each level, I can just sort by “added.” Still, would be cool to have the column in the users reports too.