1. The volume of allowances covered by Chapter III of Directive 2003/87/EC to be auctioned in any given calendar year as from 2019 shall be the quantity of allowances established in accordance with Articles 10(1) and 10(1a) of that Directive.
2. The volume of allowances covered by Chapter III of Directive 2003/87/EC to be auctioned in any given calendar year by each Member State shall be based on the volume of allowances pursuant to paragraph 1 of this Article and the share of allowances of that Member State determined pursuant to Article 10(2) of that Directive.
3. The volume of allowances covered by Chapter III of Directive 2003/87/EC to be auctioned each calendar year by each Member State pursuant to paragraphs 1 and 2 of this Article shall take into account Article 10a(5a) of Directive 2003/87/EC, the changes to be made pursuant to Articles 1(5) and (8) of Decision (EU) 2015/1814 of the European Parliament and of the Council [Decision (EU) 2015/1814 of the European Parliament