what's the monthly minimum dose of or colloid for patient 32026 since 155 months ago?
select min(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 32026 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'or colloid' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime) >= datetime(current_time,'-155 month') group by strftime('%y-%m',inputevents_cv.charttime)