Question: What year did Fifty Shades of Grey release?

Context:
Fifty Shades Darker
Fifty Shades Darker is a 2012 erotic romance novel by British author E. L. James.
 It is the second instalment in the "Fifty Shades" trilogy that traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey.
 The first and third volumes, "Fifty Shades of Grey" and "Fifty Shades Freed", were published in 2011 and 2012.
 The novel is published by Vintage Books and reached No. 1 on the "USA Today" best seller list.
Fifty Shades (novel series)
The "Fifty Shades" trilogy is a series of erotic novels by E. L. James.
 The trilogy consists of "Fifty Shades of Grey" (2011), "Fifty Shades Darker" and "Fifty Shades Freed" (2012).
 The trilogy traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey.
I Know You
"I Know You" is a song recorded by American recording artist and songwriter Skylar Grey for the soundtrack to the film "Fifty Shades of Grey" (2015).
 The song was written by Grey and Canadian composer/producer Stephan Moccio and was co-produced by Moccio and Dan Heath.
 It was released as the second promotional single from the "Fifty Shades of Grey" soundtrack on February 3, 2015.
Fifty Shades Darker (film)
Fifty Shades Darker is a 2017 American erotic romantic drama film directed by James Foley and written by Niall Leonard, based on E. L. James's novel of the same name.
 The second film in the "Fifty Shades" film series, it is the sequel to the 2015 film "Fifty Shades of Grey".
 The film stars Dakota Johnson and Jamie Dornan as Anastasia Steele and Christian Grey, respectively, with Eric Johnson, Eloise Mumford, Bella Heathcote, Rita Ora, Luke Grimes, Victor Rasuk, Kim Basinger and Marcia Gay Harden in supporting roles.
Fifty Shades of Oy Vey: A Parody
Fifty Shades of Oy Vey: A Parody by E.L. Jamesbergstein is a parody of E.L. James' "Fifty Shades of Grey".
 It was published in print and e-book editions by Alfred A. Knish in 2013.
 Described on its book jacket as "So erotic, you'll plotz," the comic novel, which follows the outline of the original "Fifty Shades of Grey", tells the story of the relationship between a beautiful young woman, Anatevka Stein, and a portly bagel tycoon, Chaim Silver.
Fifty Shades Freed
Fifty Shades Freed is the third and final installment of the erotic romance "Fifty Shades Trilogy" by British author E. L. James.
 After accepting entrepreneur CEO Christian Grey's proposal in "Fifty Shades Darker", Anastasia Steele must adjust not only to married life but to her new husband's wealthy lifestyle and controlling nature.
 The paperback edition was first published in April 2012.
Fifty Shades of Grey
Fifty Shades of Grey is a 2011 erotic romance novel by British author E. L. James.
 It is the first instalment in the "Fifty Shades" trilogy that traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey.
 It is notable for its explicitly erotic scenes featuring elements of sexual practices involving bondage/discipline, dominance/submission, and sadism/masochism (BDSM).
 Originally self-published as an ebook and a print-on-demand, publishing rights were acquired by Vintage Books in March 2012.
Fifty Shades Freed (film)
Fifty Shades Freed is an upcoming American erotic romantic drama film directed by James Foley and written by Niall Leonard, based on the novel of same name by E. L. James.
 It is the final film in the "Fifty Shades" trilogy, and a sequel to "Fifty Shades of Grey" (2015) and "Fifty Shades Darker" (2017).
 The film stars Dakota Johnson and Jamie Dornan as Anastasia Steele and Christian Grey, respectively.
Grey: Fifty Shades of Grey as Told by Christian
Grey: Fifty Shades of Grey As Told by Christian, also referred to as Grey, is a 2015 erotic romance by British author E. L. James.
 It is the fourth installment in the "Fifty Shades" series, which had its start as fanfiction.
E. L. James
Erika Mitchell (born 7 March 1963), known by her pen name E. L. James, is an English author.
 She wrote the bestselling erotic romance trilogy "Fifty Shades of Grey", "Fifty Shades Darker", and "Fifty Shades Freed", along with the companion novel ""; and under "Snowqueen's Icedragon" the Twilight fan fiction "Master of the Universe" that was the basis for the Fifty Shades trilogy.

Answer: 2011