Interesting. Last year did a quick scan of gcc/gnome/firefox/kernel looking specifically for educational contributors, or at least people contributing from .edu domains. (I realize this is not super accurate, but it gave a pointer about what institutions were contributing or had contributed.)
This might be a way to categorize some of the "unknown" or "none" bits from your tables.
Any chance you could break this down as well? (I'd noticed an impressively large Australia and China contingent, which doesn't seem to be showing up in your analysis)
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