what is the total output amount for patient 98229 until 08/21/2104?
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 98229 ) ) and strftime('%y-%m-%d',outputevents.charttime) <= '2104-08-21'