(d) of such section, and the worldwide level of diversity immigrants under subsection (e) of such section shall each be increased by the number computed under subparagraph (B) with respect to each of such worldwide levels. (B) Computation of increase For each of the worldwide levels described in subparagraph (A), the number computed under this subparagraph is the difference (if any) between the worldwide level established for the previous fiscal year under the applicable subsection of section 201 of the Immigration and Nationality Act ( 8 U.S.C. 1151 ) and the number of visas that were, during the previous fiscal year, issued and used as the basis for an application for admission into the United States as an immigrant described in the applicable subsection. (C) Clarifications (i) Allocation among preference categories The additional visas made available for fiscal years 2021 and 2022 as a result of the computations made under subparagraphs (A) and (B) shall be proportionally allocated as set forth in subsections (a), (b), and (c) of section 203 of the Immigration and Nationality Act ( 8 U.S.C. 1153 ). (ii) Elimination of fall across For fiscal years 2021 and 2022, the number computed under subsection (c)(3)(C) of section 201 of the Immigration and Nationality Act ( 8 U.S.C. 1151 ), and the number computed under subsection (d)(2)(C) of such section, are deemed to equal zero. (c) Voluntary departure Notwithstanding section 240B of the Immigration and Nationality Act ( 8 U.S.C. 1229c ), if a period for voluntary departure under such section expires or expired during the period described in subsection (d), such voluntary departure period is extended until the date that is 90 days after the end of such period. (d) Period described The period described in this subsection— (1) begins on the first day of the public health emergency declared by the Secretary of Health and Human Services under section 319 of the Public Health Service Act ( 42 U.S.C. 247d ) with respect to COVID–19