when was patient 88180 admitted to the hospital for the last time since 2104 via the clinic referral/premature?
select admissions.admittime from admissions where admissions.subject_id = 88180 and admissions.admission_location = 'clinic referral/premature' and strftime('%y',admissions.admittime) >= '2104' order by admissions.admittime desc limit 1