139 Annual Report 2021 2021 2020 Disaggregation of revenue € € Annual fees 2.099.410 2.040.582 Rendering of services 125.240 160.876 2.224.650 2.201.458 8. Revenue 2021 2020 € € Fair value gains on financial assets at fair value through profit or loss 34.578 - Sundry operating income 105.674 69.644 140.252 69.644 9. Other operating income 10. Other expenses 2021 2020 € € Fair value losses on financial assets at fair value through profit or loss - 47.267 Impairment charge of property, plant and equipment - 699 - 47.966 2021 2020 Operating surplus/(deficit) is stated after charging the following items: € € Amortisation of computer software (included in "Administration expenses") (Note 19) 836 836 Depreciation of property, plant and equipment 227.692 219.220 Staff costs including Top Management in their executive capacity (Note 12) 1.447.421 1.405.304 Auditors' remuneration 3.083 3.083 Trade receivables - impairment charge for bad and doubtful debts 140 - 11. Operating surplus/(deficit)
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