You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Doctor_Who

Context:
826 Doctor Who instalments have been televised since 1963, ranging between 25-minute episodes (the most common format), 45-minute episodes (for Resurrection of the Daleks in the 1984 series, a single season in 1985, and the revival), two feature-length productions (1983's The Five Doctors and the 1996 television film), eight Christmas specials (most of 60 minutes' duration, one of 72 minutes), and four additional specials ranging from 60 to 75 minutes in 2009, 2010 and 2013. Four mini-episodes, running about eight minutes each, were also produced for the 1993, 2005 and 2007 Children in Need charity appeals, while another mini-episode was produced in 2008 for a Doctor Who-themed edition of The Proms. The 1993 2-part story, entitled Dimensions in Time, was made in collaboration with the cast of the BBC soap-opera EastEnders and was filmed partly on the EastEnders set. A two-part mini-episode was also produced for the 2011 edition of Comic Relief. Starting with the 2009 special "Planet of the Dead", the series was filmed in 1080i for HDTV, and broadcast simultaneously on BBC One and BBC HD.

Question:
In what year did Doctor Who begin being shown in HDTV?

2009