Since the beginning of 2015, officers from the Minneapolis Police Department have rendered people unconscious with neck restraints 44 times, according to an NBC News analysis of police records. Several police experts said that number appears to be unusually high.

Minneapolis police used neck restraints at least 237 times during that span, and in 16 percent of the incidents the suspects and other individuals lost consciousness, the department’s use-of-force records show. A lack of publicly available use-of-force data from other departments makes it difficult to compare Minneapolis to other cities of the same or any size.

Police define neck restraints as when an officer uses an arm or leg to compress someone’s neck without directly pressuring the airway. On May 25, Minneapolis Police Officer Derek Chauvin was captured on video kneeling on the neck of a prone and handcuffed George Floyd for eight minutes — including nearly three minutes after he had stopped breathing.