I've been checking out Distrowatch almost daily. I go to http://distrowatch.com/table.php?distribution=mint (not that I want to skew the results toward Mint
Yesterday and today Linux Mint showed up as #1 in the last 1 month column.
I say "for the moment" because I've seen lots of fluctuation in the 1 month column. In the last couple of weeks, eg, Debian was 3rd, then went to 2nd (ahead of Mint and behind Ubuntu), then jumped back to 5th and now is at 4th.
The 3 month, 6 month and 12 month columns are much more stable. Their home page defaults to the 6 month figures.













