I've included the Actionscript and the Walmart openings data, which should be all you need to create your own Walmart growth visualization, or if you're more industrious, some other type of growth in the world. Let me know if you're able to improve upon my code as there's definitely a few areas that wouldn't mind some improvement.
So go wild, have fun with it, and let me know if you apply the code to another dataset. (I also wouldn't mind if someone wrote some documentation.)
UPDATE: I am no longer supporting this code.