I suppose it was derived somehow from https://pypi.python.org/pypi/pypstats https://pypi.python.org/pypi/pypstats As a number of people have pointed out though

I suppose it was derived somehow from https://pypi.python.org/pypi/pypstats https://pypi.python.org/pypi/pypstats As a number of people have pointed out though, there's no new data since May 2013, no idea why (https://bitbucket.org/pypa/pypi/issue/33/package-stats-no-longer-updated https://bitbucket.org/pypa/pypi/issue/33/package-stats-no-lo...), so the the '4%' number is probably out of date anyway.