Prevent a usergroup from being counted as Members in "Statistics"?

[glennno]

Is there any way to block a whole usergroup from being counted as Members under "Statistics" on the home page? If not, can it at least be done one at a time for each of that group's usernames?

Reason: I have a bunch of usernames that are part of an imported archive from an old Yahoo Group, but they're not all actual members of the forum. I put them in a separate usergroup, but they're still being counted as Members under "Statistics." This is confusing our actual members. (I tried making them a banned group, but they were still counted. Even if that had worked I'd rather not make them "banned" for other reasons.)

Thank you for any tips!