what is the yearly minimum amount of bilirubin, total, ascites patient 31243 has since 2104?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 31243 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'bilirubin, total, ascites' ) and strftime('%y',labevents.charttime) >= '2104' group by strftime('%y',labevents.charttime)