7. If the separate collection rate of the packaging referred to in paragraph 1 in a Member State decreases and remains below 90 % by weight of a given packaging format placed on the market for three consecutive calendar years, the Commission shall notify that Member State that the exemption no longer applies. A deposit and return system shall be established by 1 January of the second calendar year following the year in which the Commission notified the Member State concerned that the exemption no longer applies.