61In order to assess whether a penalty is consistent with the principle of proportionality, account must be taken, inter alia, of the nature and the degree of seriousness of the infringement which the penalty is intended to sanction and of the means of establishing the amount of the penalty (see, to that effect, judgments of 8 May 2008, Ecotrade, C‑95/07 and C‑96/07, EU:C:2008:267, paragraphs 65 to 67; and of 20 June 2013, Rodopi-M 91, C‑259/12, EU:C:2013:414, paragraph 38).
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