By 31 December 2018 and every 5 years thereafter, the Commission shall review the functioning of this Regulation. In the context of this review, the Commission shall assess whether it is necessary to produce all the data referred to in Article 4. Where the Commission considers that some of those data are no longer required, it shall be empowered to adopt delegated acts in accordance with Article 11 that delete certain data from Annexes I and II.