From the International Digital Publishing Forum Document Library via Tim O’Reilly:
The International Digital Publishing Forum collects quarterly US trade retail eBook sales in conjunction with the Association of American Publishers (AAP). For details on the AAP’s statistics program, please refer to the AAP website. The IDPF has aggregated quarterly statistics from the AAP’s program and earlier IDPF statistics program represented in the graph below.

US Trade Wholesale Electronic Book Sales
If this graph doesn’t resemble a hockey stick, I don’t what graph does.
Tags: Electronic Book Sales
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