when was the last time patient 15447 measured its respiratory rate greater than 13.0 since 07/13/2102?
select chartevents.charttime from chartevents where chartevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 15447 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'respiratory rate' and d_items.linksto = 'chartevents' ) and chartevents.valuenum > 13.0 and strftime('%y-%m-%d',chartevents.charttime) >= '2102-07-13' order by chartevents.charttime desc limit 1