Amazon captured more than half of all online sales growth last year, new data shows

According to the receipt mining company Slice, which culled data from more than 2 million digital transactions, Amazon accounted for 53 percent of U.S. e-commerce growth in 2016. That's up from 2015, when it accounted for 40 percent of e-commerce growth.

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Slice attributed much of Amazon's win to its two- to three-day lead when it comes to shipping speed. Whereas the average Amazon package was delivered in 3.4 days, that was 5.6 days from everyone else.
In all, Amazon accounted for 43 percent of all online revenue last year, according to Slice.
 http://www.cnbc.com/2017/02/01/amazon-captured-more-than-half-of-all-online-sales-growth-last-year.html