; and (ii) the number of visas issued under section 203(a), subject to this subsection, during such fiscal years; and (B) the number of unused visas from fiscal years 1992 through 2016 that were issued after fiscal year 2016 under section 203(a), subject to this subsection. . (b) Worldwide level of employment-Based immigrants Section 201(d) of the Immigration and Nationality Act ( 8 U.S.C. 1151(d) ) is amended to read as follows: (d) Worldwide level of employment-Based immigrants (1) In general The worldwide level of employment-based immigrants under this subsection for a fiscal year is equal to the sum of— (A) 140,000; (B) the number computed under paragraph (2); and (C) the number computed under paragraph (3). (2) Unused visa numbers from previous fiscal year The number computed under this paragraph for a fiscal year is the difference, if any, between— (A) the worldwide level of employment-based immigrant visas established for the previous fiscal year; and (B) the number of visas issued under section 203(b), subject to this subsection, during the previous fiscal year. (3) Unused visa numbers from fiscal years 1992 through 2016 The number computed under this paragraph is the difference, if any, between— (A) the difference, if any, between— (i) the sum of the worldwide levels of employment-based immigrant visas established for each of fiscal years 1992 through 2016; and (ii) the number of visas issued under section 203(b), subject to this subsection, during such fiscal years