 A 1996 survey of parents showed that 80% of those polled preferred the content advisory system because of its clearer detail of potentially objectionable content included within an individual program.Though the use of announcers to read aloud the program ratings was commonplace at the time the descriptors were introduced (its use having decreased since that point), only Showtime and The Movie Channel utilized verbal references to a program's content during ratings bumpers between 1994 and 1997 (which were read by longtime staff announcer Bill St. James on Showtime and by 1996, The Movie Channel).Content descriptions are also used on certain video-on-demand services operated by pay television services; currently, HBO, Cinemax and Starz are the only premium channels using descriptors on video-on-demand content, due to the services utilizing ratings bumpers seen on each of the services' linear cable channels prior to the start of a program selection.