what is the yearly maximum alanine aminotransferase (alt) value for patient 19987 until 2103?
select max(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 19987 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'alanine aminotransferase (alt)' ) and strftime('%y',labevents.charttime) <= '2103' group by strftime('%y',labevents.charttime)