This is a website that display all the data that is collected on illegal immigrants. It shows how many illegals there are, how much in social services it's costing us. And many other statistics. It's constantly being updated. You will see that the numbers are going up exponentially. Just look at the data and do a statistical analysis. I had known about this website from an American Resolve Zootube video. Please check it out.
http://immigrationcounters.com/