please clarify ---statistics of freebsd usage based on wich factor

[Jeevan]

hello sir/ madam

i am jeevan postgraduate student from united kingdom, last couple of months
i am researching on the C success factor from in
the evolution stage, part of my research i went through our FreeBSD website
i found some statistics for every month. In that it
stating usage of the released version Vs usage of that particular version,
here i have one doubt can you please help me for research

1) *when u deciding  the usage % of FreeBSD version, what factor you
considering **(if you saying 'X' % users using , with respecting of what?)*

please respond for me, reply appreciated in advance

-- 
Thanks&Regards

Jeevan