So that's averaging 40 app downloads per account in 2012 alone. Higher than I would expect, but I guess a lot of people download a lot of free apps and then immediately delete them.
Reminds me of the channel stuffing that Samsung, Motorola, and others did to tout their tablets sales.
Also reminds me of articles that identify the dominance of Android 9 or 10 months after an iPhone has shipped (and when a flagship Android device has recently shipped).
These numbers are meant to impress people who know nothing about numbers, in my opinion.