Question: Strictly Come Dancing returned for its twelfth series beginning from 7 September 2014 with a launch show, with the live shows starting on 26 and 27 September, Bruce Forsyth decided to leave the show after the eleventh series; however, Forsyth will continue to host the Christmas specials, titled Christmas Specials of "Strictly Come Dancing", and have been transmitted by BBC Television, each year since which year?
Sentence (from "Strictly Come Dancing Christmas Specials"): Early editions contained a selection of contestants from the most recent and occasionally previous seasons of the show, however from the 2010 special to the 2013 special, the competition has been contested by celebrities who are unable to compete in the main series due to time constrictions.
Relevant evidence: No