I don't think there is going to be a method to determine the number of users accurately. Anyone running cpan/cpanm can configure their client to report the installation status (pass/fail) to cpantesters. If you care enough and have the means you could setup an automatic smoker to do this without manual intervention.

In reply to Re^3: Percentage of MS Windows Perl Users by marto
in thread Percentage of MS Windows Perl Users by thechartist

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