https://www.ecb.europa.eu/press/accounts/2020/html/ecb.mg200409_1~baf4b2ad06.en.html
https://ukandeu.ac.uk/what-sunaks-tax-return-tells-us-about-the-uk-tax-system/
https://www.exact.com/benl/downloads/finance/whitepaper-cijfers-altijd-het-antwoord
https://www.ecb.europa.eu/press/key/date/2021/html/ecb.sp210226~ff6ad267d4.en.html