I have created a list of all unsubscribes, however, i cannot see when exactly each contact on that list has unsubscribed? This should be included so you are understanding who is unsubscribing when?
If nobody gets back to you on this, can’t you just create a custom property to capture the date, then create a workflow to populate this when they unsubscribe? You’d probably also want to create a workflow to clear the field is they re-subscribe.