what was the maximum yearly number of patients who were admitted for syst/diast hrt fail nos until 1 year ago?
select max(t1.c1) from ( select count( distinct diagnoses_icd.hadm_id ) as c1 from diagnoses_icd where diagnoses_icd.icd9_code = ( select d_icd_diagnoses.icd9_code from d_icd_diagnoses where d_icd_diagnoses.short_title = 'syst/diast hrt fail nos' ) and datetime(diagnoses_icd.charttime) <= datetime(current_time,'-1 year') group by strftime('%y',diagnoses_icd.charttime) ) as t1