what is the yearly minimum amount of gastric gastric tube that patient 62977 had until 34 months ago?
select min(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 = 62977 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'gastric gastric tube' and d_items.linksto = 'outputevents' ) and datetime(outputevents.charttime) <= datetime(current_time,'-34 month') group by strftime('%y',outputevents.charttime)