; (iv) if the base allocation under clause (i) or (ii) is not exhausted during any fiscal year, the base allocation under such clause for subsequent fiscal years shall be decreased by the greater of 5 percent or a percentage representing the unutilized portion of the base allocation (as a percentage of the base allocation) during that fiscal year, and if in a subsequent fiscal year the decreased base allocation is itself not exhausted, the base allocation for fiscal years subsequent to that fiscal year shall be further decreased by the greater of 5 percent or a percentage representing the unutilized portion of the decreased base allocation (as a percentage of the decreased base allocation) during that fiscal year (subject to clause (iii) and except that the base allocations under clauses (ii) shall not fall below 410,000); (v) the numerical limitations under this subparagraph shall not apply to any alien— (I) who— (aa) was physically present in the United States on October 23, 2017; and (bb) performed agricultural labor or services in the United States for at least 5.75 hours during each of at least 180 days during the 2-year period ending on October 23, 2017