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Several hundred newspapers now have paywalls of some kind, but for the most part, it’s the small and mid-size papers that have been the early adopters. Last year, for example, Gannett put all 80 of its community newspapers’ websites behind metered paywalls, while keeping its flagship paper, USA Today, free online.

But the New York Times‘ ability to attract subscribers in the two years since its paywall went live — combined with the increasingly tough digital advertising market — seems to have caused some of the bigger newspapers to reconsider. In the last year alone, six of the biggest newspapers in the U.S. have announced plans to start charging for their digital editions: the LA Times, Washington Post, Chicago Tribune, Houston Chronicle, Philadelphia Inquirer, Orange County Register.

As of now, 12 of the top-20 U.S. newspapers (by weekday circulation) have either enacted a paid scheme or plan to do so.

Click the graphic to the left to see which of the biggest newspapers have paywalls.