|Millions of euro|
|at Dec. 31, 2020||at Dec. 31, 2019||Change|
|Amounts due from institutional market operators||186||232||(46)||-19.8%|
Amounts due from institutional market operators decreased by €46 million on the previous year, mainly in Spain as a result of the remuneration of distribution operations.
At December 31, 2020 other assets mainly include tax assets in the amount of €1,539 million (€1,587 million at December 31, 2019), security deposits in the amount of €330 million (€418 million at the end of 2019) and non-monetary grants to be received in respect of green certificates amounting to €73 million (€37 million at December 31, 2019).
The change for the year mainly reflects the tax assets recognized by Enel Distribuição São Paulo and Enel Distribuição Ceará related to the PIS/COFINS dispute in Brazil in the amount of €211 million, which was more than offset by the depreciation of the Brazilian real.