If Mexico's President Calderon thinks that Illegal Aliens are contributing to the U.S. Economy, perhaps he should take a look at this website, which offers real time statistics of exactly how much Illegal Aliens are costing us:

http://www.immigrationcounters.com/
Scroll down for a complete list of costs.

Illegal Aliens are contributing to our economy, all right. They're draining it like chupacabras!