That data is hardly useful, it doesn't explain what it refers to and, even when it does, seems wrong. Compare e.g. https://www.ohloh.net/p/mediawiki/contributors?query=&sort=commits Also, https://bugzilla.wikimedia.org/weekly-bug-summary.cgi?tops=10&days=10000... proves they're not talking of the whole bugzilla but then they don't say which components.
Nemo