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* means the champion has one or more skins that are just simple recolors. Meaning even the picture has just been recolored in stead of redrawn. To me, thats a slap in the face and doesn't count as a true new skin. The more *'s there are means the more of those skins they have.
` Means the champion has recently had a skin update and therefore was moved down on the list of most needed.
N/A: Not Available
So pretty much, each group is the number of skins those champions have.
This way when someone says "OMFG Ezreal needs more skins stat!" We can look here and see that compared to other champions he is doing rather well for the number of skins he has. Poor Cho'Gath has been around for a long time now and still only has two skins, one being nothing more but a crapy recolor.
If anyone sees a mistake or something missing from the list, please let me know. I will be updating this everytime a new skin comes out.