Which of the following book retail trends showed the most significant growth between 2015-2020, defying earlier predictions of its demise?

The publishing industry has undergone dramatic transformation in recent decades. From the rise of e-books to the resurgence of independent bookstores, how literature reaches consumers continues to evolve. This trivia question explores a significant trend that reshaped the book retail landscape in the 2010s. Test your knowledge about how readers find and purchase their favorite books in today's diverse marketplace!

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Independent bookstore openings, with a 35% increase in the number of stores nationwide
Big-box retailer book departments, expanding their square footage by 28% on average
Subscription book boxes, becoming the fastest-growing book discovery method among readers under 30
Airport bookstores, which saw sales volume increase by 40% despite declining air travel