I think that you essentially have two options, both involving some custom development ...
* create a custom report, which processes a filter or a project's version, and calculate that number by reading the history of each issue, filtering if each update was a fixversion's update ... etc.
* create a calculated customfield tht updates its value each time you edit the fixversion (don't know if a listener is required)
HTH
Yes, you'll need a listener to catch the edits of fixversion, unless you remove it from the general "edit issue" screen. (Also, you'll need a listener if you have greenhoppper).
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