13. Where the lack of availability or excessive prices of specific recycled plastics makes compliance with the minimum percentages of recycled content set out in paragraphs 1 and 2 of this Article excessively difficult, the Commission shall be empowered to adopt a delegated act in accordance with Article 64 to amend those paragraphs by adjusting the minimum percentages accordingly. In evaluating whether such adjustment is appropriate, the Commission shall assess requests from natural or legal persons to be accompanied by relevant information and data on the market situation for the post-consumer plastic waste and best available evidence regarding the related risks to human or animal health, to the security of food supply or to the environment. The Commission shall adopt such a delegated act only in exceptional cases where there would be severe adverse effects for human or animal health, the security of food supply or the environment.