what is patient 93078's yearly maximum level of folate since 12/2105?
select max(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 93078 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'folate' ) and strftime('%y-%m',labevents.charttime) >= '2105-12' group by strftime('%y',labevents.charttime)