The New York Times Manga Best Sellers of 2011
A total of 18 manga titles have made first appearances in 2011. As of the 33rd week, nine titles reached the top of the weekly list (in order of number of weeks at the top of the list, from highest to lowest): Naruto, 12 weeks; Black Bird, 4 weeks; Hetalia: Axis Powers, 4 weeks; Black Butler, 3 weeks; Rosario + Vampire: Season II, 3 weeks; Yu-Gi-Oh!
Source: Wikipedia — The New York Times Manga Best Sellers of 2011 (CC BY-SA 4.0)