Not later than January 1, 2020, and every three years thereafter, each state agency, as defined in § 4-212, shall submit to the Secretary of the Office of Policy and Management for approval an agency procurement plan that includes, but is not limited to, a list of all services and programs the agency intends to contract for over the three-year period next succeeding such report, and a planned schedule of procurements indicating whether such procurements shall be based on competitive negotiation or competitive quotations, or whether the state agency has determined that a sole source purchase of services is required and the agency intends to apply to the secretary for a waiver in accordance with the guidelines adopted under § 4-215.