###HUMAN: what is the number of patients who were admitted before the year 2115 for insertion of non-drug-eluting coronary artery stent(s)?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.admityear < "2115" AND procedures.long_title = "Insertion of non-drug-eluting coronary artery stent(s)"