to answer your question, the only relevant publications that may help you are reports. Chapters and user groups report at least annually, but we have not done a comparison between affiliate groups. We have only done this comparative studies for program mapping [1] and grants accountability purposes [2].

You can find the annual reports on Meta here: https://meta.wikimedia.org/wiki/Reports That page is where all affiliates latest reporting is cataloged, and is always updated. Some of them are a simple count of activities, others have more narrative and more data. 

Hope that helps!

Best, 

María

[1] https://meta.wikimedia.org/wiki/Grants:Evaluation/Evaluation_reports 

[2] https://meta.wikimedia.org/wiki/Grants:Evaluation/Evaluation_at_the_Wikimedia_Foundation 

María Cruz