Question: The group that owns the luxury watch company Longines was founded in which year?

full_context: Document 1: Longines: Longines (] , ) is a luxury watch company based in Saint-Imier, Switzerland. Founded by Auguste Agassiz in 1832, it is currently owned by the Swatch Group. Its winged hourglass logo is the oldest registered trademark for a watchmaker.
Document 2: The Hour Glass Limited: The Hour Glass Limited (SGX:AGS) is a luxury watch retail group in Asia. The group currently owns and operates 41 retail stores across 9 cities. Headquartered in Singapore, it reported revenues of $734.9 million for FY 2015. Net profit was up by 5% to S$57.9 million from S$54.9 million in FY2014, outperforming a contracting regional luxury market. In addition, the group also deals in luxury properties and owns high-end retail and commercial properties throughout Asia. Most notably was their recent purchase of two high-end Australian properties for $37.2 million in 2015.
Document 3: The Swatch Group: The Swatch Group is a Swiss manufacturer of watches and jewelry. The company was founded in 1983 by Nicolas Hayek from the merger of Allgemeine Gesellschaft der Schweizerischen Uhrenindustrie (ASUAG) and Société Suisse pour l'Industrie Horlogère (SSIH).
Document 4: Swatch (disambiguation): Swatch is Swatch Group's namesake brand of watches.
Document 5: Nicolas Hayek: Nicolas George Hayek (19 February 1928, Beirut – 28 June 2010, Biel/Bienne), was a Swiss-Lebanese entrepreneur, co-founder, CEO and Chairman of the Board of the Swatch Group, with principal headquarters in Biel/Bienne.
Document 6: Maurice Lacroix: Maurice Lacroix is a luxury brand of Swiss watches based in the Canton of Jura and headquartered in Zurich.
Document 7: Swatch: Swatch is a Swiss watchmaker founded in 1983 by Nicolas Hayek, and is subsidiary of The Swatch Group. The product line was developed as a response to the "quartz crisis" of the 1970s and 1980s, in which Asian-made digital watches were competing against traditional European-made mechanical watches.
Document 8: Endura Watch Factory: Endura S.A. is Swiss watch manufacturer founded in 1966 by General Watch Company (GWC) in Biel/Bienne, Switzerland, for the purpose of manufacturing watches under "private label". This company was also part of the merger between ASUAG and SSIH into SMH, now the Swatch Group. Now attached to ETA SA Manufacture horlogère Suisse, Endura SA is the Private Label and licensing division of the Swatch Group.
Document 9: Rolex: Rolex SA ( ) is a Swiss luxury watchmaker. The company and its subsidiary Montres Tudor SA design, manufacture, distribute and service wristwatches sold under the Rolex and Tudor brands. Founded by Hans Wilsdorf and Alfred Davis in London, England in 1905 as Wilsdorf and Davis, Rolex moved its base of operations to Geneva, Switzerland in 1919.
Document 10: ETA SA: ETA SA Manufacture Horlogère Suisse (ETA SA Swiss Watch Manufacturer) designs and manufactures quartz watches and both hand-wound and automatic-winding mechanical ébauches and movements. Commonly referred to as ETA, the company is headquartered in Grenchen, Switzerland and is a wholly owned subsidiary of The Swatch Group Ltd.
Document 11: Eberhard &amp; Co.: Eberhard & Co is a Swiss luxury watch company, founded in 1887 in La Chaux-de-Fonds, Neuchâtel, Switzerland by Swiss watch making industrialist Georges Eberhard.
Document 12: Concord watch: Concord Watch Company is a Swiss luxury goods company that is part of the Movado group that owns Movado, Ebel, ESQ, Coach and Hugo Boss. Founded in 1908, Concord was purchased in 1970 by the North American Watch Company, which also distributed the Piaget and Corum lines of watches. From the late 1970s to the late 1980s, Concord produced what would become some of the most marketed and respected luxury quartz watches on the market. Concord watches became recognized in large cities as status symbols and were noted for their innovation and design. Flagship quartz models such as the Concord Centurion and Concord Delirium ranged from $2,000 to $20,000 surpassing the price of base automatic Rolex, Cartier and Omega wristwatches. By the 1990s Concord watches fell out of style and grew obsolete amidst the re-branding of the company. While the brand still exists today, it never regained its market position nor visibility that it once had.
Document 13: Universal Genève: Universal Genève SA is a Swiss luxury watch company, founded in 1894 as "Universal Watch".
Document 14: Wenger: Wenger is one of two companies that have manufactured Swiss Army knives. Based in Delémont, Wenger was acquired by rival Victorinox in 2005. Since 2013, Wenger Swiss Army knives are integrated in the Victorinox collection (as the "Delémont collection"); the brand Wenger remains for watches and licensed products.
Document 15: Eterna: Eterna is a Swiss luxury watch company founded in Grenchen, Canton Solothurn on 7 November 1856 by Josef Girard and Urs Schild. The company is now owned by Hong Kong based Citychamp Watch & Jewellery Group Limited (an investment holding company formerly known as China Haidian Holdings until 2014).
ground_truth: 1983