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said Thursday that revenue from its cloud unit increased almost 24% in the fourth quarter, topping analysts’ estimates.

Amazon Web Services generated $35.58 billion in revenue, according to a statement. Analysts polled by StreetAccount had expected $34.93 billion. AWS represented about 17% of Amazon’s total revenue for the quarter.

Operating income within AWS came to $12.47 billion, more than StreetAccount’s $11.91 billion consensus, accounting for most of its parent company’s profits. AWS’ operating margin widened slightly to 35% from 34.6% in the third quarter.

Amazon leads the cloud infrastructure market, which its introduced almost 20 years ago, but Google