A quick update for those keeping track of how well the iOS developer money train is chugging along: As of its earnings call this morning, Apple has paid out over $20 billion to iOS developers.

More surprising than the overall amount, however, is the rate at which the money is coming in. Of the $20 billion paid out since the App Store launched in 2008, “nearly half” of it has been paid out in the last 12 months.

As of January of this year, Apple had paid out $15 billion. That means around $5 billion was paid out in the last six months. By comparison, Google mentioned back at I/O that they’d paid out $5 billion to developers in the past year.

(For those curious about what Apple’s cut of all this was, a quick calculation: Apple’s share is 30 percent, with the developer taking 70 percent. $20B is 70 percent of around $28.57 billion, meaning Apple has made around $8.5 billion from app sales so far.)