The bi-state development agency shall set and attain goals for the inclusion of fifteen percent minority business enterprises, as defined in section 37.013, and five percent women business enterprises in all contracts for the operation of bus and rail services. The attainment of such goals shall be based upon the availability of minority-owned businesses operating within the urban area in Missouri that perform the services for which such contract is to be awarded. This section shall become null and void when the agency meets the goals for two consecutive years.