Request for Inventory activity log report

We have a large inventory with a range of suppliers. These suppliers are constantly updating the pricing and sometimes they drop product lines or make changes to product codes. The problem is that I import these price updates in bulk (using the Dear template) so am not always aware that some products have been dropped.

I am therefore wanting to run a report that identifies all SKU's and when the most recent activity was. I can then find any items in it that have not had a price updates in the past 12 months so that I can deprecate them. It would be great to be able to run a report that gave me this information