How can I generate a report of time logged per person and not per task?

I've been looking through the forums and have found similar questions, but not quite the exact thing I'm looking for. So I apologize in advance if this question has already been answered and I missed the post (I hate creating duplicates).

I've been playing around with the built-in reports in JIRA, in particular the Workload Pie Chart report. I wanted to see if I could get a report of how many hours an individual in a project has logged across all the tasks he has logged work in. What I found was disappointing.

I made a single test ticket in a brand new fix version (so it was the only ticket available in my query) and assigned it to myself (person A), and logged 5 hours on the task. I then assigned the ticket to a co-worker (person B), and he logged 10 hours on the task. When I ran the workload report by assignee and on time spent, the only person that appeared in the report was person B with a total log time of 15 hours (his hours plus my hours). What I was hoping I would get was person A having 5 hours and person B having 10 hours.

The problem is, person B was the last assignee for the task. And the task currently had 15 hours logged on it. So, the report says that person B has 15 hours logged. The report does not go into the task and extract the hours per individual – just the total hours on the task and the last person assigned.

So, I think you know my question. How can I generate a time logged report per person regardless of if the task they were involved in was also worked on by other individuals?