how many times has the exc pituit les-transphen been taken since 2100?
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 = 'exc pituit les-transphen' ) and strftime('%y',procedures_icd.charttime) >= '2100'