Over 14.million smartphone users scanned QR/Bar code, reaching 14.5 percent of the smartphone audience in EU5 (France, Germany, Italy, Spain and UK) during the three month average ending March 2012. More than half of the smartphone audience that scanned a QR/bar code did so from a printed magazine or newspaper (50.9 percent), making it the most popular source. Over 38.0 percent of the smartphone audience scanned a QR/bar code that was printed on product packaging, making it the second most popular source in EU5.
https://www.comscoredatamine.com/2012/05/do-qr-codes-work-best-in-magazines-and-newspapers/