what is the yearly maximum cholesterol, ldl, calculated level of patient 27703 since 11/2105?
select max(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 27703 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'cholesterol, ldl, calculated' ) and strftime('%y-%m',labevents.charttime) >= '2105-11' group by strftime('%y',labevents.charttime)