how many adrenal exploration nos treatments have been performed until 2102?
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 = 'adrenal exploration nos' ) and strftime('%y',procedures_icd.charttime) <= '2102'