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A 2013-2018 report (GOA4) found that in 2018 over 700,000 articles were published in gold open access in the world, of which 42% was in journals with no author-paid fees.<ref name="GOA4" /> The figure varies significantly depending on region and kind of publisher: 75% if university-run, over 80% in Latin America, but less than 25% in Western Europe.<ref name="GOA4">{{Cite book |last=Walt Crawford |url=https://waltcrawford.name/goa4.pdf |title=Gold Open Access 2013-2018: Articles in Journals (GOA4) |publisher=Cites & Insights Books |year=2019 |isbn=978-1-329-54713-1 |access-date=30 August 2019 |archive-url=https://web.archive.org/web/20190506181508/https://waltcrawford.name/goa4.pdf |archive-date=6 May 2019 |url-status=live}}</ref> However, Crawford's study did not count open access articles published in "hybrid" journals (subscription journals that allow authors to make their individual articles open in return for payment of a fee). More comprehensive analyses of the scholarly literature suggest that this resulted in a significant underestimation of the prevalence of author-fee-funded OA publications in the literature.<ref>{{Cite journal |last1=Piwowar |first1=H. |last2=Priem |first2=J. |last3=Larivière |first3=V. |last4=Alperin |first4=J. P. |last5=Matthias |first5=L. |last6=Norlander |first6=B. |last7=Farley |first7=A. |last8=West |first8=J. |last9=Haustein |first9=S. |year=2018 |title=The state of OA: A large-scale analysis of the prevalence and impact of Open Access articles |journal=PeerJ |volume=6 |pages=e4375 |doi=10.7717/peerj.4375 |pmc=5815332 |pmid=29456894 |doi-access=free }}</ref> Crawford's study also found that although a minority of open access ''journals'' impose charges on authors, a growing majority of open access ''articles'' are published under this arrangement, particularly in the science disciplines (thanks to the enormous output of open access "mega journals", each of which may publish tens of thousands of articles in a year and are invariably funded by author-side charges—see Figure 10.1 in GOA4).
According to [[Scopus]] database in August, 2024, 46.2% of works, indexed therein and published in 2023, had some form of open access. More than half of the OA publications (27.5% of all indexed works in 2023) were in fully Gold Open Access sources, 16.7% of all were in Green OA sources (i.e. which allow for self-archiving by authors), 9.2 % in Hybrid Gold OA sources (such as journals, which have open access and behind-paywall articles in the same issue), and 10.6 % were in Bronze OA sources (free-to-read on the publishers' websites).<ref>https://www.scopus.com/results/results.uri?sort=plf-f&src=s&sid=7c069198c393343d11b72b903c0e4a02&sot=a&sdt=a&sl=14&s=PUBYEAR+%3D+2023&origin=searchadvanced&editSaveSearch=&txGid=45ccd8149540fa063d893d60c4e835dc&sessionSearchId=7c069198c393343d11b72b903c0e4a02&limit=10 {{
[[File:Percentage of Open Access articles from 8 oldest journal publishers, WebOfScience data.png|thumb|Percentage of Open Access articles from 8 oldest journal publishers. The data were extracted from Web of Science database on 2023-01-30.]]
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