It costs $13 million per year to house each of the 40 prisoners at Guantánamo Bay detention camp, according to The New York Times. The US military stations 45 troops per prisoner there.
The estimated annual cost of $540 million covers the 12-month period that ended last Sept. 30 and does not include expenses that have remained classified, presumably including a continued C.I.A. presence. But the figures show that running the range of facilities built up over the years has grown increasingly expensive even as the number of prisoners has declined.