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    Language popularity on GitHub programming beust.com
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    I think the original link had a much better explanation of the trends you see in the graphs:

    http://redmonk.com/dberkholz/2014/05/02/github-language-trends-and-the-fragmenting-landscape/

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      The fact that Ruby came in 3 times more popular than the nearest other language in 2008 should explain the “Sharp decline” in the years since.