what is the yearly minimum eosinophils level of patient 50286 since 09/2104?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 50286 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'eosinophils' ) and strftime('%y-%m',labevents.charttime) >= '2104-09' group by strftime('%y',labevents.charttime)