when did patient 92846 get admitted to hospital for the last time since 2104 via transfer from hosp/extram?
select admissions.admittime from admissions where admissions.subject_id = 92846 and admissions.admission_location = 'transfer from hosp/extram' and strftime('%y',admissions.admittime) >= '2104' order by admissions.admittime desc limit 1