when did patient 59941 come to the hospital for the last time until 2104 via an phys referral/normal deli?
select admissions.admittime from admissions where admissions.subject_id = 59941 and admissions.admission_location = 'phys referral/normal deli' and strftime('%y',admissions.admittime) <= '2104' order by admissions.admittime desc limit 1