; provided that, in the absence of complete actual cost data representing the provision of the full covered benefit in such preceding fiscal years, certified community behavioral health clinics may, at the State’s discretion, use estimated or projected data relating to specific services for which they lack cost experience. The per-unit rate derived from such cost data shall be adjusted to take into account any increase or decrease in the scope of such services furnished by the clinic in the fiscal year involved. (3) Payment for services in succeeding fiscal years Subject to paragraphs (4), (5), and (6), for services described in section 1905(a)(31) furnished by a clinic for which a State elects to provide for payment for such services in accordance with the payment option under paragraph (1) and that are furnished in a fiscal year that is not described in paragraph (2), the State plan shall provide for payment for such services in an amount (calculated on the basis of daily visits or unduplicated monthly visits, at the State’s election) that is equal to the amount calculated under this subsection for such services and clinic for the preceding year— (A) increased by the percentage increase in the inflationary factor described in section 1834(aa)(2)(C)