And why the stonewalling? If there was no hidden agenda why not just quote previous years usage to establish need?
If you poke around, you'll find exactly such a quotation provided in writing to a senator who requested the data.
Their ammunition usage has actually been dropping over the time period quoted--something like 3-4 years.
As others have pointed out, until DHS starts buying .22LR, .22WMR, Percussion caps, etc., it's pretty obvious that their orders are not what is causing the shortage. Certainly anyone using ammo is contributing to the shortage, but based on the information I've seen DHS ammunition usage and orders are not out of line compared to past history.