Case C-96/15: Judgment of the Court (Third Chamber) of 16 June 2016 (request for a preliminary ruling from the Tribunal de grande instance de Nanterre — France) — Saint Louis Sucre, formerly Saint Louis Sucre SA v Directeur général des douanes et droits indirects (Reference for a preliminary ruling — Agriculture — Sugar — Production levies — Right to reimbursement — Sugar held in stock and not exported — Undue enrichment — Freedom to conduct a business — Method of calculation)