It is standard practice for US depositary receipts to charge an annual administration fee up to USD 0.05 per share depending on the issuing depositary bank.
The intent of the fee is to cover costs for the banks that take on the operational processes necessary to issue and trade the depositary receipt line.
Typically the fee is deducted when dividend payments are made, however, in case the depositary receipt does not pay a dividend or did not include the custodial fee in their dividend events, the fee will be administered through fee-only events.
The dividend fee is stipulated in the Deposit Agreement between the depositary bank and the company based upon industry standards. The Deposit Agreement is filed with the SEC and is readily accessible by the public.
The fee per depositary receipt is not dependent on the total amount of dividend being paid but the amount of shares held.