After 10 Years, Amazon’s AWS Is a $10 Billion Business | Re/code

Quoting from Amazon's latest 8-K letter to shareholders

"Amazon Web Services “is bigger than Amazon.com was at 10 years old, growing at a faster rate, and — most noteworthy in my view — the pace of innovation continues to accelerate,” Bezos wrote, adding that the unit added 722 new features in 2015, which amounted to a 40 percent increase over the prior year.

Last month AWS observed its 10th year of operations, and was the bright spot in an otherwise disappointing fourth-quarter report in January. The unit clocked $7.9 billion in revenue in 2015, amounting to more than 7 percent of Amazon’s overall sales, with an operating margin of 24 percent."

After 10 Years, Amazon’s AWS Is a $10 Billion Business | Re/code