Question: What percentage of share of the chain supermarkets has in supermarket sector in the United Kingdom who's subsidiary is Argos?

Context paragraphs:
C1000: C1000 was a Dutch supermarket chain.  Founded on 1 April 1977, the chain had 500 stores as of 2012, with a market share of 12.1%.  The supermarket chain operates in a rather unusual manner for supermarkets in the Netherlands, using the franchise system.

Argos (retailer): Argos is a British catalogue retailer operating in the United Kingdom and Ireland, and a subsidiary of Sainsbury's.  The company trades both through physical stores and online, with over 845 retail stores, 29 million yearly store customers, and nearly a billion online vistors per annum, makes it one of the largest high street retailers in the United Kingdom.

Wellcome: Wellcome (; Cantonese: "Wai Hong" in Hong Kong; in Taiwan) is a supermarket chain owned by Jardine Matheson Holdings via its Dairy Farm International Holdings subsidiary.  The Wellcome supermarket chain is one of the two largest supermarket chains in Hong Kong, the other being PARKnSHOP.  Wellcome also operates supermarkets in Taiwan and the Philippines under the Wellcome name.  The parent company, Dairy Farm, also has other supermarket interests in the Asia Pacific under different brand names.

Super Epsa: Super Epsa is the former name of a supermarket chain in Lima, Peru, which was founded in 1953 by ALDO E OLCESE as Super Market S.A.  The importance of this Supermarket chain lies in that it was the first occurrence of an American-style supermarket in Perú.  Aldo Olcese was born in Lima on December 29, 1922.  His father was a hard working Italian-Genoese immigrant.  Aldo went to the United States in 1946 to study Business Administration at the University of Texas at Austin and he graduated in 1950.  During his lifetime, as a student in the United States, he was impressed with one Super Market close to his residence where he frequently shopped together with his wife, and since then he thought it would be a great idea to carry out the same kind of self-service Super Market in Perú.  In 1953, and for the first time in the Peruvian History, the first supermarket was officially opened in Av Larco 670, Miraflores, with great success.  After 20 years in the Super Market business, the company opened a total of 14 supermarkets scattered throughout the Peruvian capital.  Therefore, we can consider without any doubt, that Aldo E Olcese, was the pioneer or first person that brought the first self-service Super Market to Perú in 1953.  His great-grandson, Carlo Olcese, is former Eminent Archon

Fiesta Mart: Fiesta Mart Inc. is an American supermarket chain based in Houston, Texas that was established in 1972.  Fiesta Mart stores are located in Texas.  The chain uses a cartoon parrot as a mascot.  As of 2004 it operated 34 supermarkets in Greater Houston, 16 supermarkets in other locations in Texas, and 17 Beverage Mart liquor store locations.  During the same year it had 7.5% of the grocery market share in Greater Houston.  Many of its stores were located in Hispanic neighborhoods and other neighborhoods with minority ethnic groups.

Countdown (supermarket): Countdown is a New Zealand full-service supermarket chain and subsidiary of Progressive Enterprises, itself a subsidiary of Australia's Woolworths Limited.  It is the largest single supermarket chain in New Zealand in terms of number of stores, though the Four Square chain owned by co-operative rival Foodstuffs - with operations mainly as superettes or smaller supermarkets in rural communities - is larger, with 275 franchised shops.

Atlantic (supermarkets): Atlantic (Greek: Ατλάντικ ) was a large supermarket chain in Greece.  Atlantic supermarkets were founded in 1980 by Panayiotis Apostolou.  Up to 1985 the company was a small chain with just 5 stores.  After 1985 the company expanded rapidly through both organic growth and a number of acquisitions and takeovers.  Atlantic was a public company and its shares used to trade in the Athens Stock Exchange from 2000 up to 2010.  As of 2006–2007, the company had 182 stores nationwide and was the fifth largest supermarket chain in Greece as measured by market share.  The company had also operated a franchise network of smaller stores branded "ARISTA".  Since 2009 the company had suffered from serious financial difficulties (mainly due to excessive borrowing) and eventually (in 2011) went into liquidation.  The company ceased all trading as of 3 August 2011.

Pick-N-Pay Supermarkets: Pick-N-Pay Supermarkets was a chain of supermarkets which operated in the Greater Cleveland, Ohio area.  The company's origin can be traced to the year 1928 and the opening of a small dairy store in Cleveland Heights, Ohio by Edward Silverberg who then expanded his operation and created a chain of such stores which he called Farmview Creamery Stores.  In 1938, Mr. Silverberg opened a supermarket on E. 185th Street which he called Pick-N-Pay.  In 1940, he changed the name of all his stores to Pick-N-Pay Supermarkets.  He grew the chain to a total of 10 stores and in 1951 sold the company to Cook Coffee Company (later, as of 1969, Cook United, Inc.).  Under Cook Coffee's ownership, the chain continued to grow through expansion and through Pick-N-Pay's acquisition of the Foodtown supermarkets in 1959.  In 1972, it was sold to a group of private investors led by Julius Kravitz (previously the head of Foodtown).  who continued the use of the brand for the newly independent company.  Principal competitors in the Greater Cleveland market were the Fisher-Fazio-Costa, Stop-N-Shop, and Heinen's grocery chains.

Sainsbury's: Sainsbury's is the second largest chain of supermarkets in the United Kingdom, with a 16.9% share of the supermarket sector in the United Kingdom.  Founded in 1869, by John James Sainsbury with a shop in Drury Lane, London, the company became the largest grocery retailer in 1922, was an early adopter of self-service retailing in the United Kingdom, and had its heyday during the 1980s.  In 1995, Tesco overtook Sainsbury's to become the market leader, and Asda became the second largest in 2003, demoting Sainsbury's to third place for most of the subsequent period until January 2014, when Sainsbury's regained second place.

Asda: Asda Stores Ltd. is a British supermarket retailer, headquartered in Leeds, West Yorkshire.  The company was founded in 1965 when the supermarket owning Asquith family merged with the Associated Dairies company of Yorkshire.  It expanded in to the south of England during the 1970s and 1980s, and acquired Allied Carpets, 61 large Gateway Supermarkets and other businesses, such as MFI, then during the 1990s, sold off its acquisitions to concentrate on the supermarkets.  It became a subsidiary of the American retail corporate giant Walmart after a £6.7 billion takeover in July 1999, and was the second-largest supermarket chain in Britain between 2003 and 2014 by market share, and is currently third behind Tesco and Sainsbury's.

Supporting paragraphs: Argos (retailer) Sainsbury's
Answer: 16.9%