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. 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. 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. 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).