Time line of stock contents data

Hello friends,
how would I create time line data of my stock - ideally as a graphical display, or as numbers to be fed into LibO? Meaning: Whenever the amount of items in stock changes, a new number and the corresponding date should be available.
Hope I was clear enough…

You can use Product Quantities by Warehouse which is available as relate of product (see Product Quantities By Warehouse (Computer))