Question: In which year did this Canadian electronic music group formed in 2006 in Toronto by Ethan Kath and Alice Glass release their fourth full-length album?

Context paragraphs:
Jonas Reinhardt: Jonas Reinhardt is an American electronic music group from Brooklyn, New York with releases on Kranky, Not Not Fun, and others.  The group's sound is influenced by electronic music of the 1970s,'80s, '90s and even 2000s, particularly in the use of analog synthesizers and keyboards.  A debut full-length was released in 2008, with a follow-up issued in 2010 called "Powers of Audition".  The next full-length, "Music for the Tactile Dome", came out in May 2011.  In 2012, Jonas Reinhardt collaborated with visual artist Abyss of Fathomless light for a cassette-only full length on VCO cassettes.  In April 2013, the fourth full-length album, "Mask of the Maker", was released on Not Not Fun.

Crystal Castles (album): Crystal Castles is the debut studio album by Canadian electronic music duo Crystal Castles; at the time of its release, the group consisted of producer Ethan Kath and singer Alice Glass.  The two met each other in 2004 and both had an interest in noise music acts like AIDS Wolf.  This inspired the two to start a project that made noise music, but instead of guitars, they would using electronic sounds made with an circuit-bent Atari 5200, which led multiple journalists to describe their genre of music as a chiptune style they did not intend it to be categorized as.

Air War: "Air War" is a single by Crystal Castles.  It was released on 17 December 2007 by Trouble Records as a 7" vinyl.  An earlier version of the song was released in July 2006 as the B-Side to "Alice Practice" on Merok Records.  The lyrics are from the James Joyce book "Ulysses" in Chapter 11: Sirens.  The cover art gathered public interest because of the odd picture of Ethan Kath and Alice Glass with ice cream cones as heads.

The Maine (band): The Maine is an American rock band from Tempe, Arizona, formed in 2007.  Their first release, the EP "Stay Up, Get Down" was released in late 2007, followed by a five-song EP titled "The Way We Talk" on December 11, 2007.  The band's first full-length album, "Can't Stop Won't Stop" was released July 8, 2008. " ...And a Happy New Year" was released in December 2008.  Their second full-length album, "Black & White", (July 13, 2010) sold 22,634 copies in its first week.  On December 6, 2011, the group's third album, "Pioneer", was released and it peaked at No. 90 on the Billboard 200.  Their fourth full-length record "Forever Halloween"(June 4, 2013) reached No. 39 on the Billboard 200 by selling over 10,000 copies in its first week and was followed by its deluxe edition on June 17, 2014.  Their fifth studio album, "American Candy", was released on March 31, 2015. " Lovely Little Lonely", their sixth full-length record, was released on April 7, 2017.

III (Crystal Castles album): III (stylized as (III)) is the third studio album by Canadian electronic music duo Crystal Castles, released on November 7, 2012 by Fiction Records and Polydor Records.  Production was handled by Ethan Kath, with additional production by Jacknife Lee.

Crystal Castles (band): Crystal Castles are a Canadian electronic music group formed in 2006 in Toronto, Ontario by founding members songwriter/producer Ethan Kath and songwriter/vocalist Alice Glass.  Current band members consist of Ethan Kath and Edith Frances.  Crystal Castles are known for their chaotic live shows and lo-fi melancholic homemade productions.  They released many limited vinyl singles between 2006 and 2007 before releasing a trilogy of critically acclaimed albums between 2008 and 2012.

Alice Glass (EP): Alice Glass is the debut extended play (EP) by Canadian singer and songwriter Alice Glass, released on August 18, 2017 through Loma Vista Recordings.  The EP marks Glass' first collection of solo material since her departure from electronic band Crystal Castles in 2014.

Canadian Electronic Ensemble: The Canadian Electronic Ensemble (CEE) is a Canadian electronic music ensemble based in Toronto, Ontario.  Founded in 1971 by David Grimes, David Jaeger, Larry Lake and James Montgomery, it is the oldest continuously active live-electronic performing group in the world.  In 1984 they performed at the International Society for Contemporary Music's World Music Days Festival.  In 1986 they joined the Toronto Symphony Orchestra to perform the world premiere of Steven Gellman's "Universe Symphony".  The ensemble has also appeared in concerts with the Orchestre Métropolitain de Montréal, the Ottawa Symphony Orchestra, and the Vancouver Symphony Orchestra.  Since 1974 the CEE has presented an annual concert series in Toronto.  They have also given regular international tours since 1975.  Since 1985 Lake has served as the CEE's Artistic Director.  The ensemble's other current members are Jaeger, Montgomery, Paul Stillwell, Rose Bolton, and John Farah.

Crimewave (song): "Crimewave" is a song performed by Canadian experimental band Crystal Castles and American noise rock band Health from Crystal Castles' self-titled debut album.  The song acts as both Crystal Castles and Health's debut singles in addition to being the first single from the album "Crystal Castles".  It was first released on August 13, 2007 by PIAS Recordings accompanied by the b-side "XxzxcuZx Me".  The song is a re-working of the Health original track of the same name written by the band members of Health for their self-entitled debut album.  It was re-written by Ethan Kath of Crystal Castles.  Kath also produced the re-worked track.  The song contains prominent electro and chiptune musical characteristics.  The track consists of only three lyric lines and has been said to tell a story about the sadness and ennui one might experience when locked inside a "Pac-Man" maze for eternity.

Amnesty (I): Amnesty (I) is the fourth full-length album by electronica duo Crystal Castles, released on August 19, 2016, on Fiction Records and Casablanca Records.  It is the first album since the departure of previous frontwoman Alice Glass in 2014, and the first to feature new vocalist Edith Frances.  Released nearly four years after the band's previous album, it marks the longest gap between consecutive studio albums by the group.

Supporting paragraphs: Amnesty (I) Crystal Castles (band)
Answer: 2016