There are actually plenty of references in there to publicly available numbers such as revenues, profit etc. and links to plenty of original data points, but for ease of reading I've mostly added them as links rather than lots of data.

That being said, I take your point there isn't data available to back everything up (as you'll know, companies are pretty selective about releasing some data points), and so I've leant more on press sentiment in those cases.

I think a better indicator would be year over year changes in sales- but you also have to figure product cycles into that.