Amazon.com, Inc. AMZN 0.19%‘s Prime Day 2016 is in the books, and the sale was the biggest shopping day in history. But was this year’s Prime Day as impressive as last year’s? Here’s a look at the numbers.

According to Amazon, customer orders during this year’s Prime Day topped customer orders for last year’s Prime Day by 60 percent worldwide. Based on MKM Partners‘ estimates of sales from last year’s Prime Day, Amazon may have totaled $640 million in incremental sales on Prime Day this year.

“We want to thank our tens of millions of members around the world for making this the biggest day in the history of Amazon,” vice president Greg Greeley said in a press release.

Amazon shares rebounded slightly on Wednesday following a sharp downturn on Tuesday after ChannelAdvisor reported that Prime Day sales were trending flat year-over-year.

Although Amazon doesn’t release official sales totals, Prime Day 2015 reportedly topped Black Friday 2014 sales by 18 percent.

Amazon also reportedly captured 36 percent of all online Black Friday sales in 2015. Total Black Friday sales were…

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