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The percentage of Open Access publications by French authors has increased from 38% in 2018 to 62% in 2021.
(frenchopensciencemonitor.esr.gouv.fr)
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Maybe driven by funding agencies asking for open access research outputs.
Is this a common practice?
Yes, totally. At least at European level. https://ec.europa.eu/research/participants/docs/h2020-funding-guide/cross-cutting-issues/open-access-data-management/open-access_en.htm