If I read:
63 revs, 12 users 21% Committing to a name
What is it referring to? Number of edits, character count etc...?
For the history and details of this percentage calculation, see Mixing Oil and Water: Authorship in a Wiki World by Jeff Atwood. Quote:
I simply sum the total size of all line contributions (insertions or deletions) from any given author in a revision, with a small bonus multiplier of 2x for the original author. We report the highest percentage of authorship in the final revision.