Question: The film Gerald Potterton did animation work on came out in what year?

Context paragraphs:
My Financial Career: My Financial Career is a 1962 animated short directed by Gerald Potterton, based on a story of the same name from Stephen Leacock's "Literary Lapses" collection of short fiction.  The six and a half minute film takes a humorous look at a young man's attempt to open a bank account.  Produced by Colin Low and Tom Daly for the National Film Board of Canada, the film was named Best Animated Short at the 1962 San Francisco International Film Festival and was nominated for an Academy Award for Best Animated Short Film at the 36th Academy Awards.

Gerald Potterton: Gerald Potterton (born 8 March 1931) is a British–Canadian director, producer and animator.  He is best known for directing the cult classic "Heavy Metal" and his animation work on "Yellow Submarine".

Heavy Metal (film): Heavy Metal is a 1981 Canadian-American adult animated sci-fi-fantasy film directed by Gerald Potterton and produced by Ivan Reitman and Leonard Mogel, who also was the publisher of "Heavy Metal" magazine, the basis for the film.  The screenplay was written by Daniel Goldberg and Len Blum.

Yellow Submarine (film): Yellow Submarine (also known as The Beatles: Yellow Submarine) is a 1968 British animated musical fantasy comedy film inspired by the music of the Beatles, directed by animation producer George Dunning, and produced by United Artists and King Features Syndicate.  Initial press reports stated that the Beatles themselves would provide their own character voices; however, aside from composing and performing the songs, the real Beatles participated only in the closing scene of the film, while their cartoon counterparts were voiced by other actors.

The Awful Fate of Melpomenus Jones: The Awful Fate of Melpomenus Jones is a very short story by Stephen Leacock.  It was re-published in Literary Lapses in 1910.  It is read by John Le Mesurier on a 1976 LP "What Is Going To Become Of Us All? " It was made into a short movie by Gerald Potterton in 1983.

The Railrodder: The Railrodder is a 1965 short comedy film starring Buster Keaton in one of his final film roles, directed by Gerald Potterton and produced by the National Film Board of Canada (NFB).  A 25-minute comedic travelogue of Canada, "The Railrodder" was also Keaton's final silent film, as the film contains no dialogue and all sound effects are overdubbed.

Christmas Cracker (film): Christmas Cracker (French: Caprice de Noël) is a 1963 animated short about Christmas, co-directed by Norman McLaren, Gerald Potterton, Grant Munro and Jeff Hale.  The film consists of three segments: a rendition of "Jingle Bells" in which cutout animation figures dance, a dime-store rodeo of tin toys and a story about decorating the perfect Christmas tree with a Christmas star.  Produced by the National Film Board of Canada, this film without words garnered seven awards including the prize for Best Animated Short at the 1964 San Francisco International Film Festival and a nomination for an Academy Award for Best Animated Short Film at the 37th Academy Awards.

The Real Story of Happy Birthday to You: The Real Story of Happy Birthday to You is a Canadian children's animated short film directed by Gerald Potterton as part of "The Real Story of..." / "Favorite Songs" animated anthology series.  The short was produced by Cinar and France Animation in association with Crayon Animation and Western Publishing and was released in January 1992 in the United States.  It also features the voices of Edward Asner and Roger Daltrey.

Rob Coleman: Rob Coleman (born April 27, 1964) is a Canadian animation director who works with award-winning Australian visual effects and animation studio, Animal Logic.  He joined Animal Logic in 2012 as the studio’s Head of Animation.  Coleman is a two-time Oscar nominee for his animation work on "" and "" and has been nominated for two BAFTA Awards for his work on "Men in Black" and "Star Wars: The Phantom Menace".

Jorge Alderete: Jorge Alderete (born 1971), also known as Dr. Alderete, is an Argentine illustrator, animator, editor and owner of several businesses, best known for his comic book and kitsch aesthetic in his work.  Most of Alderete’s career has evolved in Mexico, where he came in 1998 and with the exception of a year in Spain, has since stayed, living and worked from his apartment in Colonia Roma in Mexico City.  Most of his work is related to Mexico City’s music scene, especially rock and surf bands, having created about eighty CD covers and various other promotional items including the billboards for the 2011 Vive Latino music festival.  Alderete’s work has appeared in publications, including anthologies of graphic arts in Mexico, the United States and Europe and has also done animation work for MTV, Nickelodeon and Mexican television.

Supporting paragraphs: Gerald Potterton Yellow Submarine (film)
Answer: 1968