US Census Bureau: E-commerce sales in 2016 accounted for 8.1 percent of total sales. E-commerce sales in 2015 accounted for 7.3 percent of total sales.

Jeff Bezos in an interview with Charlie Rose, April 2, 1999:

But you know, the predictions of the demise of physical retailing as a result of e-commerce are very, very premature and exaggerated. They’re– this kind of prediction comes all the time. When television was invented, people predicted the demise of the movie theaters. And the when the VCR came along, they said, ”Well, this time for sure the movie theaters”– now I’ve started to hear people say with DVD players and home theater systems, which are very high-quality, that movie theaters are gone. This is crazy because people are a gregarious species. We humans are very gregarious. We like to gather. So I think maybe 10-plus years from now, maybe 15 percent — one-five percent — might go on line with commerce.