Are the current statistics of questions migrated to other sites visible somewhere? I suspect it is available through https://math.stackexchange.com/tools/posts/migrated/stats for > 10k rep users, so I can't see it at the moment. Perhaps someone can publish it?
Specifically, I am interested in how many questions were migrated to stats.stackexchange.com and physics.stackexchange.com versus number of questions migrated to stackoverflow.com (for example during last few years or so), just to see if there is or is not a basis for allowing to flag for migration to the later site as well.
Migration statistics to other sites could be also interesting if they are comparable to the above sites.