WLD,
stats. of deaths in the troubles are not like those of the holocaust which include estimates and extrapolations.
Each figure is an individual whose death has been reported and in most cases compensated.
Den recently gave a link to a list of every person killed by the security forces, with the circumstsances of each death and known affilliations to paramilitary groups. Such lists could be found for all the deaths.
They really are not disputed.
I use this Irish site if I need figures.
http://www.wesleyjohnston.com/users/ireland/past/troubles/troubles_stats.html#statusperpetrator