instruction: what is the average total hospital cost that includes a procedure called a therapeutic antibacterials - rifampin until 2104?
response: SELECT AVG(t1.c1) FROM (SELECT SUM(cost.cost) AS c1 FROM cost WHERE cost.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.patientunitstayid IN (SELECT treatment.patientunitstayid FROM treatment WHERE treatment.treatmentname = 'therapeutic antibacterials - rifampin')) AND STRFTIME('%y', cost.chargetime) <= '2104' GROUP BY cost.patienthealthsystemstayid) AS t1