One every 2 minutes.
Given that Verizon isn't the only telecom operator in the US, the percentage of people under surveillance is quite significant.
And I assume this is only non-secret requests, we've heard news about such requests that are accompanied by a gag order which probably wouldn't end up in transparency reports.
Furthermore, the vast majority of these requests are subpoenas (161K) which can be issued in divorce proceedings or legal tussles over car accidents (was the driver texting?) among other uses.
I can't even fathom how many there must be if you throw in Microsoft, Google, Yahoo, AT&T, Sprint, and countless others.