 Beginning in 1994, the production schedule was changed so that 10 new episodes a year were produced instead of 15.Shortly thereafter, as of August 11, 1995, the episodes from the "first series" (1968–76) were withdrawn from the repeat schedule, since there were over 200 "second series" episodes available for broadcast, and many of the first series episodes had become outdated.The show's final years varied the number of episodes produced per season