How many comments do you need to write to get to a different level?

I'm currently at level 2 and i wrote 57 comments, but how many comments do I need to write to get to level 3? I closed that "window" (wouldn't know how to call it) which told me how many comments I needed to post to get to level 3, so can anyone tell me how many comments I need to write to get to a specific level? Or is there a page with all the informations about the levels? I can't find any