[OneWingedShark]

One article I read said it was 4.7 but I think it depends on the study and interpretation.

Ceiling of 4.7 would be 5; I'm probably just paraphrasing that study (I skimmed the one linked to that story).

[driftdiver]

Nevertheless, the NSA is monitoring every American (except those in mosques) and providing the data to other federal agencies to include IRS, DEA, DHS, FBI and probably anyone else who asks for it.