From OpenAccess.NL:
On February 13, the 10,000th open access article was administered published in the year 2019 within the national agreements with publishers. It is the first time that this number has been achieved in a year.
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It is estimated that—the exact figures will be announced later this year—this will be around 25% of the total number of articles published in the Netherlands in 2019. Open access is of course achieved through other channels as well. For example, the number of open access publications that appear with full open access publishers and platforms is increasing. These routes are still outside the current national deals.
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See Also: More Recent Open Access Reports News