How can I know which downloaded item are being uploaded at what speed via long-terming seeding?

I just found that while no finished downloads are seeding, the overall upload speed is not zero but 2.5MB/s. So I think the uploading speed is being used by long-terming seeding. So which one of the finished downloads are being uploaded? I want to know about it. Maybe there is a colum like long-term seeding upload speed?