Why not ask former President Bush?

Since October 7, 2001 775 detainees have been brought to Guantánamo. Of these, about 420 have been released without charge. As of now, about 245 detainees remain. Of those released, the Bush adminsistration released 420 as folows:

July 2005, 242 detainees were moved out of Guantánamo, including 173 that were released without charge, and 69 transferred to the governments of other countries, according to the U.S. Department of Defense.

November 2005, 358 of the then-505 detainees held at Guantánamo Bay had Administrative Review Board hearings. Of these, 3% were granted and were awaiting release, 20% were to be transferred, 37% were to be further detained at Guantánamo, and no decision had been made in 40% of the cases.