All retained payments and interest thereon disbursed to any contractor under any contract with a public entity covered under this article shall be disbursed to each subcontractor by the contractor. The disbursement of such retained payments and interest shall be in proportion to the respective amounts of retained payments, if any, which the contractor theretofore has withheld from his subcontractors if the subcontractor has performed under his contract with the contractor.
C.R.S. § 24-91-109