Interesting PDF report from the organization that manages the framework:
https://www.scrumalliance.org/scrum/media/scrumalliancemedia/files%20and%20pdfs/state%20of%20scrum/scrum-alliance-state-of-scrum-2015.pdf
Quoting:
"The State of Scrum reports offer comprehensive coverage of global usage of Scrum -- who is using Scrum, where, how, and why. The report also looks at how and where Scrum is best adopted and is growing. "
PS. Heard of it from the "Fluffy Side of Scrum" book authors @ Agile Portugal 2015 (2016-06-05).
(@2016-10-13: Added quote)
