"Overall, 71 percent of all clients who received residential mental health treatment services on April 29, 2016, were voluntarily admitted for care, and the remaining 29 percent were admitted with an involuntary legal status."

Source

Substance Abuse and Mental Health Services Administration, National Mental Health Services Survey (N-MHSS): 2016. Data on Mental Health Treatment Facilities. BHSIS Series S-98, HHS Publication No. (SMA) 17-5049. Rockville, MD: Substance Abuse and Mental Health Services Administration, 2017, p. 28.
https://www.samhsa.gov/data/m…
https://www.samhsa.gov/data/s…