Informal and Formal
I suppose the declared figure is the Formal value.
But how many informal requests (ie covert requests bypassing formalities, protocols and procedures but probably/improbably following informal protocols and procedures?)
Yahoo! has joined such companies as Facebook, Google, Microsoft, and Twitter in pledging to release semiannual reports on how often it responds to requests from governments for information about its users. The first such report, published on Friday, summarizes data compiled from January 1 through June 30, 2013, and it shows …
But the main thing is that they are declaring the figures: total requests and total number of different user accounts named - helping to put into the public domain information about the scale of government activities.
Now the public debate can start to move the disclosure goal posts so that the data becomes more granular.