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?
answer: 2004