For each State fiscal year beginning on July 1, the Department shall establish a cap, approved by CMS, for the number of unduplicated individuals who may receive the services covered under this chapter, based on available State and federal funding. The annual cap for waiver participation may be revised, based on the Department's updated estimates of participants' Program expenditures for the State fiscal year, as compared with the available funding. Eligible individuals shall be enrolled in the waiver program on a first-come, first-served basis until the annual cap on waiver participation is reached. Once the annual cap on waiver participation is reached: A registry shall be established for individuals interested in applying for waiver services; and Individuals on the registry shall have an opportunity to apply for the waiver as openings become available.