Download/sales/usage statistics?

[Zoltan Boszormenyi]

Hi,

my wife writes her essay on product and promotion relationship
on a freely chosen subject and she chose Linux. Specifically,
she would like to select one version of a distribution and collect
sales or download statistics during its lifetime. Is it possible
to find such info about e.g. Red Hat Linux 9? It's old enough,
it has reached EOL officially. Or about a later community distribution,
such a Fedora Core 3, which is also EOL.

Best regards,
Zoltán Böszörményi