This is possible to do unless the version has been released, in this case the fixVerison is essentially hidden. I found this frustrating from the point of view, as you say, of looking at historical burndowns on an individual basis.
Since fixVersion is no longer used in GreenHopper 6 this funtionality will not be changed. The new way of organising Sprints via the new Sprint field allows one to see historical burndowns.
However, if you have a setup where your backlog is the parent of the fixVersion you can open a Statistics burndown chart by children to see the historical burndown as a series of historgrams.
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