Yes, it would be nice to be able to elaborate on the statistics a bit more, although this is probably beyond what is practicable.
It's possible to infer or guess a few further details by knowing who someone's employers are, but what I would find really interesting would be some background on voluntary developers, which must be quite a diverse demographic - long-term veterans, consultants expanding their credentials, professional students (probably the highest figure), developers migrating from another project, hobbyists etc. It might give further clues as to why this statistic has dropped, too.
I suppose this would be a lot too complicated to compile though. How are the 'none' and 'unknown' stats arrived at?
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