According to The NPD Group (via NBC News), a market research company which has collected data on the decade’s book sales, from 2011 through 2019, Fifty Shades of Grey sold 15.2 million copies, while Fifty Shades Darker hit 10.4 million copies sold and Fifty Shades Freed came in with 9.3 million editions sold.
The two sequels she penned for the sexytime-filled novel, Fifty Shades Darker and Fifty Shades Freed, actually round out the top three for best-selling books of the decade.
In fact, Fifty Shades of Grey was so popular among readers that the good news for E.L. James doesn’t end there.