tell me the number of times retrograde pyelogram is done until 1 year ago?
select count(*) from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'retrograde pyelogram' ) and datetime(procedures_icd.charttime) <= datetime(current_time,'-1 year')