Given the task definition and input, reply with output. This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

The network began running into some trouble in the ratings by 2010. That year, the sixth and final season of Lost became the drama's lowest-rated season since its debut in 2004. Ratings for the once-instant hit Ugly Betty collapsed dramatically after it was moved to Fridays at the start of its fourth season in the fall of 2009; an attempt to boost ratings by moving the dramedy to Wednesdays failed, with its ultimate cancellation by the network eliciting negative reaction from the public, and particularly the show's fanbase. With the network's two former hit shows now out of the picture, the network's remaining top veteran shows Desperate Housewives and Grey's Anatomy, and another hit drama Brothers & Sisters, all ended the 2009–10 season recorded their lowest ratings ever.
What year marked the lowest ratings for the drama Lost?