what is the yearly maximum bands value for patient 28020 until 2103?
select max(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 28020 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'bands' ) and strftime('%y',labevents.charttime) <= '2103' group by strftime('%y',labevents.charttime)