It's just in how the data is collated. All of Americans didn't get asked if they own an ereader in the initial report to come up with the 32%. Just as all of Americans didn't get asked if they own an ereader for the later report to come up with 19%. And sure as shootin'... the same Americans didn't get asked each time.
I'm not saying the different numbers don't indicate that less dedicated eink ereaders are being purchased (mostly because I think it does indicate that). I'm saying the 13% change doesn't say much of anything about whether previous eink device owners are destroying them (or giving them away).
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