That's what I'm talking about - it was over 500.

Indeed, government documents indicate more than 500 detainees were released or transferred from Guantanamo while George W. Bush was president. A White House executive order issued on the second day of Obama’s presidency said, ” The federal government has moved more than 500 such detainees from Guantánamo, either by returning them to their home country or by releasing or transferring them to a third country.”

That’s backed up by a fact sheet from the military task force that runs the detention camp, which says 520 detainees had been released or transferred by March 2009.