Passage: Before 1954, all Tom and Jerry cartoons were produced in the standard Academy ratio and format; in 1954 and 1955, some of the output was dually produced in dual versions: one Academy-ratio negative composed for a flat widescreen (1.75:1) format and one shot in the CinemaScope process. From 1955 until the close of the MGM cartoon studio a year later, all Tom and Jerry cartoons were produced in CinemaScope, some even had their soundtracks recorded in Perspecta directional audio. All of the Hanna and Barbera cartoons were shot as successive color exposure negatives in Technicolor; the 1960s entries were done in Metrocolor but returned to the standard Academy ratio and format. The 2005 short The Karate Guard was also filmed in the standard Academy ratio and format.

Question: In what year did the Tom and Jerry cartoons permanently move to CinemaScope production?
1955