I wouldn't even believe that during the holiday season there was only 3 iPads sold for every 1 Android tablet. Without sales data I'll continue believing Android basically doesn't exist on tablets in any measurable number until shown otherwise.
Not trying to be an ass about it or anything, I just don't think I've ever seen a convincing report that's shown how Android is at all penetrating the tablet market in any number worth mentioning.
Here's a chart showing web impressions of other tablets...per 100 iPad impressions:
So for every 100 iPads that were active, there were less than 3 Kindle Fires...and that is leading the pack following by the damn Playbook of all things. And this data was pulled less than a month ago.
This data actually means something to me versus whatever crap is in the OP, no offense to the OP.
Edit: This is US + Canada data only specifically I'm referencing here, although I have no reason to believe the trend is dramatically different overseas. If anything I'd expect Europe to be slightly higher percentage wise, but probably still not cracking anything over 25%.