That's not my question.
My question is related to your statistics here, which don't appear to be accurate. If you follow your logic, that you do actually complete just about every file, that you do reach a conclusion at the end of the day for the vast majority of your files, given the number you have each year, even if you just move them one or two years in advance, they still don't add up to these numbers.
How many files does the department have right now that you can't get to because you physically don't have the staff to get to them? Maybe that would be a better way to get that number.