Question: When was Boneland, the sequel to "The Weirdstone of Brisingamen" was written by English author Alan Garner in what year?

full_context: Document 1: The Moon of Gomrath: The Moon of Gomrath is a fantasy story by the author Alan Garner, published in 1963. It is the sequel to "The Weirdstone of Brisingamen".
Document 2: Alan Garner: Alan Garner OBE (born 17 October 1934) is an English novelist best known for his children's fantasy novels and his retellings of traditional British folk tales. Much of his work is firmly rooted in the landscape, history and folklore of his native county of Cheshire, North West England, being set in the region and making use of the native Cheshire dialect.
Document 3: The Moon and More: The Moon and More is Sarah Dessen's eleventh book, published in June 2013, and is a young adult novel. The protagonist, Emaline is a Colby native, a small beachside town, and so summer at the beach for her means hard work and a new population of beach goers. During this, her last summer before college, Emaline meets Theo while working for her family's rental business. He's a city boy who's come to Colby as the assistant to a high-strung documentary filmmaker who's in town to profile a reclusive local artist. Emaline knows he's not her type, but she can't help feeling drawn to him. And as their relationship develops, Emaline finds herself questioning her own goals, values, and choices.
Document 4: Stephens Gerard Malone: Stephens Gerard Malone is a Canadian-born novelist. Born in Trenton, Ontario, he was educated in Montréal, Quebec. He currently lives and writes on Canada’s east coast city of Halifax, Nova Scotia where he’s written for a variety of media, including television and periodicals. In 1994, he published his first novel "Endless Bay" (Mercury Press) under the pseudonym, Laura Fairburn. His second novel, "Miss Elva" (Random House, Canada) followed in 2005 and was short-listed for the Dartmouth Book Award. Malone’s third novel "I Still Have A Suitcase In Berlin" (Random House, Canada) took eight years to write and was released in May 2008. The book was translated into French in 2011 under the title "5 Minutes de plus à Berlin" and was published by Québec Amérique. "Big Town", the author's fourth novel, is a fictionalized account of the eviction of the citizens of Africville in the late 1960s. It was published by Vagrant Pres in September 2018.
Document 5: Strandloper (novel): Strandloper is a novel by English writer Alan Garner, published in 1996. It is loosely based on the story of a Cheshire labourer, William Buckley. The historical figures of Edward Stanley and John Batman also appear as characters in the novel.
Document 6: Elidor: Elidor is a children's fantasy novel by the British author Alan Garner, published by Collins in 1965. Set primarily in modern Manchester, it features four English children who enter a fantasy world, fulfill a quest there, and return to find that the enemy has followed them into our world. Translations have been published in nine languages and it has been adapted for television.
Document 7: The Owl Service: The Owl Service is a low fantasy novel for young adults by Alan Garner, published by Collins in 1967. Set in modern Wales, it is an adaptation of the story of the mythical Welsh woman Blodeuwedd, an "expression of the myth" in the author's words.
Document 8: The Giver: The Giver is a 1993 American young adult dystopian novel by Lois Lowry. It is set in a society which at first appears to be utopian but is revealed to be dystopian as the story progresses. The novel follows a 12-year-old boy named Jonas. The society has eliminated pain and strife by converting to "Sameness", a plan that has also eradicated emotional depth from their lives. Jonas is selected to inherit the position of Receiver of Memory, the person who stores all the past memories of the time before Sameness, as there may be times where one must draw upon the wisdom gained from history to aid the community's decision making. Jonas struggles with concepts of all the new emotions and things introduced to him: whether they are inherently good, evil, or in between, and whether it is even possible to have one without the other. The Community lacks any color, memory, climate, or terrain, all in an effort to preserve structure, order, and a true sense of equality beyond personal individuality.
Document 9: Utopia (Child novel): Utopia (ISBN  ) is the first solo novel by Lincoln Child published in 2002. It is set in a futuristic amusement park called "Utopia", a park that relies heavily on holographics and robotics. Dr. Andrew Warne, the man who designed the program that runs the park's robots, is called in to help fix a problem. But when he gets there, he finds out that the park is being held hostage by a mysterious man known as John Doe.
Document 10: The Graveyard Book: The Graveyard Book is a children's fantasy novel by the English author Neil Gaiman, simultaneously published in Britain and America during 2008. "The Graveyard Book" traces the story of the boy Nobody "Bod" Owens who is adopted and raised by the supernatural occupants of a graveyard after his family is brutally murdered.
Document 11: The Weirdstone of Brisingamen: The Weirdstone of Brisingamen: A Tale of Alderley is a children's fantasy novel written by the English author Alan Garner (born 1934). Garner began work on the novel, his literary debut, in 1957 after he moved into the late mediaeval house Toad Hall, in Blackden, Cheshire. The story, which took the local legend of The Wizard of the Edge as a partial basis for the novel's plot, was influenced by the folklore and landscape of the neighbouring Alderley Edge where he had grown up. Upon completion the book was picked up by the publisher Sir William Collins who released it through his publishing company Collins in 1960.
Document 12: The Philosopher's Stone (novel): The Philosopher's Stone is a 1969 novel by the English writer Colin Wilson. It tells the story of two researchers who find a way to reach a higher state of consciousness, which leads to frightening revelations about humanity's distant history. Like Wilson's 1967 novel "The Mind Parasites", "The Philosopher's Stone" uses motifs from H. P. Lovecraft's Cthulhu Mythos.
Document 13: Gareth P. Jones: Gareth P. Jones is a British children's writer, and author of the Dragon Detective Agency series of books. He is most famous for his comic-gothic book, "The Considine Curse", which won the Blue Peter Book of the Year 2012 and for "The Thornthwaite Inheritance". He also writes a series of books called Ninja Meerkats. His most recent book is called "Constable & Toop" and is a Victorian ghost story set in London, 1884. [Update: His most recent book is now "The Society of Thirteen".] As well as being an author, Gareth works as a TV producer.
Document 14: Alan Garner (disambiguation): Alan Garner is an English author.
Document 15: Boneland: Boneland is a 2012 novel by Alan Garner, a sequel to "The Weirdstone of Brisingamen" and "The Moon of Gomrath". The boy Colin from the earlier novels is now an adult, still living near the top of Alderley Edge but now a Professor working at the nearby Jodrell Bank Observatory. His solitary home is a kit-built hut ("A Bergli") in a quarry. He has a form of amnesia which means he remembers nothing from before the age of 13, including his twin sister and his childhood adventures. He visits a psychotherapist and the gradual uncovering of his past forms the main story.
ground_truth: 2012