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"): The Christmas Specials of "Strictly Come Dancing" have been transmitted by BBC Television each year since 2004.
Relevant evidence: Yes