With 2011 coming to an end this weekend, Mission: Impossible - Ghost Protocol once again claimed the top spot at the box office. Not far behind were fellow sequels Sherlock Holmes: A Game of Shadows and Alvin and the Chipmunks: Chipwrecked, followed by a surging War Horse and The Girl with the Dragon Tattoo. The Top 12 earned an estimated $151 million, which is a slight improvement over the same frame last year and 15 percent up on 2005 (the last time New Year's fell on a Sunday).







