the number of such visas made available to natives of any single foreign state or dependent area in the appropriate fiscal year may not exceed 25 percent (in the case of a single foreign state) or 2 percent (in the case of a dependent area) of the total number of such visas. (B) Unreserved visas With respect to the immigrant visas made available under each of paragraphs (2), (3), and (5) of section 203(b) of such Act ( 8 U.S.C. 1153(b) ) and not reserved under paragraph (1), for each of fiscal years 2020, 2021, and 2022, not more than 85 percent shall be allotted to immigrants who are natives of any single foreign state. (3) Special rule to prevent unused visas If, with respect to fiscal year 2020, 2021, or 2022, the operation of paragraphs (1) and (2) of this subsection would prevent the total number of immigrant visas made available under paragraph (2) or (3) of section 203(b) of such Act ( 8 U.S.C. 1153(b) ) from being issued, such visas may be issued during the remainder of such fiscal year without regard to paragraphs (1) and (2) of this subsection. (4) Transition rule for currently approved beneficiaries (A) In general Notwithstanding section 202 of the Immigration and Nationality Act, as amended by this Act, immigrant visas under section 203(b) of the Immigration and Nationality Act ( 8 U.S.C. 1153(b) ) shall be allocated such that no alien described in subparagraph (B) receives a visa later than the alien otherwise would have received said visa had this Act not been enacted. (B) Alien described An alien is described in this subparagraph if the alien is the beneficiary of a petition for an immigrant visa under section 203(b) of the Immigration and Nationality Act ( 8 U.S.C. 1153(b) ) that was approved prior to the date of enactment of this Act. (5) Rules for chargeability Section 202(b) of such Act ( 8 U.S.C. 1152(b) ) shall apply in determining the foreign state to which an alien is chargeable for purposes of this subsection.