Each year before 31 March , each producer or importer which holds a licence under Article 10(6 ) shall , for each substance for which an authorisation has been received , report to the Commission , sending a copy to the competent authority of the Member State concerned , the nature of the use , the quantities used during the previous year , the quantities held in stock , any quantities recycled , reclaimed or destroyed , and the quantity of products and equipment containing or relying on those substances placed on the Community market and/or exported .