how many times did patient 59049 have the platelet count tested since 2105?
select count(*) from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'platelet count' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 59049 ) and strftime('%y',labevents.charttime) >= '2105'