With 2011 coming to an end this past weekend, "Mission: Impossible - Ghost Protocol" once again claimed the top spot at the box office. 　　The fourth Mission: Impossible movie took in 38.3 million US dollars over the three-day weekend, bringing its total sale to 141.2 million US dollars. Ghost Protocol has officially exceeded Mission: Impossible 3's total 134 million US dollars. 　　Additionally, the movie passed the latest Sherlock Holmes movie on Sunday to become the top-grossing movie of December 2011. 　　The latest installment is about to break more records, with the next big milestone being the original Mission: Impossible's 181 million US dollars, which looks very reachable at this point. 　　Not far behind were fellow sequels "Sherlock Holmes: A Game of Shadows" and "Alvin and the Chipmunks: Chipwrecked." 　　Robert Downey Jr.'s filck raked in 26.5 million US dollars, pushing the total ticket sale to 136.5 million US dollars, while the singing chipmunks earned 21 million US dollars during the weekend, with the total box office being raised to 97.3 million US dollars. 　　No. 4 went to Steven Spielberg's "War Horse," which grossed in 19.2 million US dollars on its second weekend. "War Horse" received a Golden Globe best drama nomination. 　　Following closely behind at No. 5 was "The Girl with the Dragon Tattoo" with 19 million US dollars, also during its second weekend of release. 　　No. 6 to No. 10 were holdovers from past weeks, including "We Bought A Zoo" at 16.5 million US dollars, "The Adventures of Tintin" at 15 million US dollars, "New Year's Eve" at 7.7 million US dollars, "The Darkest Hour" at 5.2 million US dollars, and "The Descendants" at 4.2 million US dollars. 　　What's worth mentioning was the "Iron Lady," starred by Meryl Streep as Margaret Thatcher, the former Prime Minister of the United Kingdom. The film was only released in 4 theaters, raking in 280,000 US dollars during its opening weekend.