Any surveys of usage of Subversion vs. all the others?

Have there been any surveys on how many people / companies / projects
use Subversion vs, all the others (CVS, VSS, RCS, Perforce, PVCS, etc.)?

I got another email today from one of our users (the one who hates
global revving and directory-based checkouts and refuses to use the
checkout-modify-merge model and wants us to change to VSS) asking
when we were going to get a "real" revision control system.

Not that it would change his mind but it would help ME if I had a
website I could point people to that shows, in any kind of even
marginally-authoritative form, what the Subversion market share is
relative to all the others.

I pointed him to
http://subversion.tigris.org/testimonials.html#open-source-projects-using-svn
but that's just a list of open source projects using Subversion,
doesn't give any kind of a comparison or market share vs the others,
and anyway I can't exactly claim it's unbiased... :-)

Thanks...

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Received on Sat Feb 3 16:31:30 2007