From TVbytheNumbers:
"With several CW shows returning to new episodes that week, they bobbed up to the top of the most DVR’d on a % basis ranks, as Smallville saw its adults 18-49 ratings increase by 44% after its airdate in its Live+7 ratings. While Vampire Diaries and Supernatural were just behind, adding 37% and 33% to their adults 18-49 airdate ratings respectively."
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Source: TVbytheNumbers.com.