during this year, when did patient 32804 last enter the hospital via the transfer from hosp/extram?
select admissions.admittime from admissions where admissions.subject_id = 32804 and admissions.admission_location = 'transfer from hosp/extram' and datetime(admissions.admittime,'start of year') = datetime(current_time,'start of year','-0 year') order by admissions.admittime desc limit 1