That's a tough question, it does seem like something that would be asked all the time, but it's also in that realm of information that is valuable to some and probably gets sold more often then published.

It sounds like you've already done an extensive search and I just checked with a few sources and it's unlikely you'll find up-to-date data on that subject for free (not saying its not out there, but it will be a challenge for anybody to find)

You can probably narrow the marketshare down to 10 however, I found this great article. I Hope it helps, and maybe even contact the journalist perhaps these numbers came up in his research.

http://www.flickr.com/photos/33749589@N07/3230044949/


Source(s):
http://ecommerce-software-review.toptenreviews.com/

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