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Each registrant has to calculate the yearly tonnage for the registration dossier. The yearly tonnage is calculated as the volume per manufacturer/importer per calendar year, unless stated otherwise. For phase-in substances that have been imported or manufactured for at the least three consecutive years, quantities are calculated on the basis of the average production or import volumes for the three preceding calendar years (Article 3 (30) of the REACH Regulation). Detailed guidance and practical examples are provided in Section 2.2.6 'Calculation of the volume to be registered' of the Guidance on registration: http://echa.europa.eu/guidance-documents/guidance-on-reach