https://techcrunch.com/2017/12/28/aws-showed-no-signs-of-slowing-down-in-2017/

AWS had a successful year by any measure. The company continued to behave like a startup with the kind of energy and momentum to invest in new areas not usually seen in an incumbent with a significant marketshare lead.

How good a year was it? According to numbers from Synergy Research, the company remains the category leader by far with around 35 percent marketshare. Microsoft sits well behind in second place with around 11 percent. Yet AWS showed growth every quarter with an overall growth rate of over 40 percent, fairly remarkable when you consider that it is operating from a large marketshare position where it becomes much more difficult to continue hanging up such big numbers.