Originally shared by Miguel Afonso Caetano"A total of 399,854 articles were published with the CC-BY license by members of OASPA during the period shown above, with 120,972 of those being published in 2013 alone. These numbers only include articles that were published in journals whose entire content is Open Access, so articles that were published in hybrid OA journals are not included."
Growth of Fully OA Journals Using a CC-BY License | Open Access Scholarly Publishers Association