3%/3.333% for every (1) mulitplayer game not completed, be it voluntarily (quitting), unintentionally (computer or internet probs) or by third party responsibility (quitter, technical probs, WGT issues).
(1) except for Alternate stroke, since a revision about 10 days ago.
The count is averaged over 30 MP games, thus it takes a while to purge any drop.