"Prime experiences record-breaking holiday season – more than three million new members worldwide joined Prime during the third week of December aloneAmazon.com Investor Relations: Press Release
Prime members made The Man in the High Castle the most watched TV season on Prime Video this holiday by 4.5x and doubled their total viewing hours of Prime Video titles, compared to 2014
Biggest holiday ever for Amazon Devices – up 2x over last year’s record-setting holiday
Over 200 million more items shipped for free with Prime this holiday season
Prime Now has busiest day ever on Christmas Eve – last order delivered at 11:59 p.m. to a customer in San Antonio, Texas"
Tuesday, December 29, 2015
Amazon.com Investor Relations: Amazon Celebrates a Record-Setting Holiday for Prime, Amazon Original Series and Amazon Devices
Check the source for some additional Amazon year-end stats