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1.By way of derogation from points 4.1(a) and 4.1(b) of Section 1 of Annex I to Implementing Regulation (EU) 2019/317, the key performance indicator on the year-on-year change of the average Union-wide ‘determined unit cost’ (DUC) for en route air navigation services shall be defined, in respect of calendar years 2020 and 2021, as a combined value for those 2 years, expressed as a percentage change from the Union-wide baseline value referred to in point (a) of Article 9(4) of Implementing Regulation (EU) 2019/317. For this purpose, a single average Union-wide DUC for calendar years 2020 and 2021 shall be calculated as a ratio between the total en route determined costs at Union level for those 2 calendar years and the total en route service units at Union level for those 2 calendar years.
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