what is the average cost of the hospital that albumin involves since 2103?
select avg(t1.c1) from ( select sum(cost.cost) as c1 from cost where cost.hadm_id in ( select prescriptions.hadm_id from prescriptions where prescriptions.drug = 'albumin' ) and strftime('%y',cost.chargetime) >= '2103' group by cost.hadm_id ) as t1