Commission Delegated Regulation (EU) 2021/1972 of 11 August 2021 supplementing Regulation (EU) 2021/1139 of the European Parliament and of the Council establishing the European Maritime, Fisheries and Aquaculture Fund and amending Regulation (EU) 2017/1004 by laying down the criteria for the calculation of the additional costs incurred by operators in the fishing, farming, processing and marketing of certain fishery and aquaculture products from the outermost regions