what is the monthly maximum urine out foley output that patient 73155 has had since 01/18/2101?
select max(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 = 73155 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'urine out foley' and d_items.linksto = 'outputevents' ) and strftime('%y-%m-%d',outputevents.charttime) >= '2101-01-18' group by strftime('%y-%m',outputevents.charttime)