what is the daily average value of patient 16066's rdw until 2104?
select avg(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16066 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'rdw' ) and strftime('%y',labevents.charttime) <= '2104' group by strftime('%y-%m-%d',labevents.charttime)