Question: Since when has the company which acquired Walkers in 1989 been owned by PepsiCo
Context: Mountain Dew (sometimes stylized as Mtn Dew) is a carbonated soft drink brand produced and owned by PepsiCo.  The original formula was invented in 1940 by Tennessee beverage bottlers Barney and Ally Hartman.  A revised formula was created by Bill Bridgforth in 1958.  The rights to this formula were obtained by the Tip Corporation of Marion, Virginia.  William H. "Bill" Jones of the Tip corporation further refined the formula, launching that version of Mountain Dew in 1961.  In August 1964, the Mountain Dew brand and production rights were acquired from Tip by the Pepsi-Cola company, at which point distribution expanded more widely across the United States and Canada. Caffeine-Free Pepsi-Cola was introduced, under the brand name Pepsi Free, in 1982 by PepsiCo as the first major-brand caffeine-free cola in years.  (The Canada Dry Company had marketed "Sport Cola," which was also caffeine-free, in the 1960s, but that brand of cola was not a success.)  A sugar-free variant, then known as Diet Pepsi Free, was also introduced.  The Pepsi Free name itself was phased out in 1987, and today these colas are known simply as Caffeine-Free Pepsi and Caffeine-Free Diet Pepsi.  The term "Free" had been reintroduced by PepsiCo on their Sierra Mist line in response to Coca-Cola's successful introduction of their Zero line (although the "Free" refers to a lack of sugar rather than caffeine, since Sierra Mist is already caffeine-free), though in 2008 that drink had reverted to its previous name of Diet Sierra Mist. Duke's Lemonade is a lemon based aerated drink marketed in India since 1889.  The brand has a strong presence in western India.  Originally owned by Duke and Sons, the brand was sold to PepsiCo in 1994.  Pepsico phased out most drinks under the Duke's brand in 2004, though it retained Duke's Lemonade.  Not only was Duke's Lemonade retained, in the same year Pepsico launched a new advertisement campaign in Mumbai to promote the brand, with a new tagline, "takatak taajgi". PepsiCo, Inc. is an American multinational food, snack, and beverage corporation headquartered in Purchase, New York.  PepsiCo has interests in the manufacturing, marketing, and distribution of grain-based snack foods, beverages, and other products.  PepsiCo was formed in 1965 with the merger of the Pepsi-Cola Company and Frito-Lay, Inc.  PepsiCo has since expanded from its namesake product Pepsi to a broader range of food and beverage brands, the largest of which included an acquisition of Tropicana Products in 1998 and the Quaker Oats Company in 2001, which added the Gatorade brand to its portfolio. Snack Brands Australia (SBA) is one of the largest suppliers of snack foods in Australia and acts as the main competitor to the long established The Smith's Snackfood Company, currently a subsidiary of the American company PepsiCo.  SBA was formed in August 1998 and is owned by parent company Snack Foods Limited.  The company was acquired by Universal Robina (URC Philippines) in 2016. Walkers is a British snack food manufacturer mainly operating in the United Kingdom and Ireland.  Walkers was founded in 1948 in Leicester, England by Henry Walker, and acquired by Lay's owner, Frito-Lay, a division of PepsiCo, in 1989.  It is best known for manufacturing potato crisps, and other, non-potato-based snack foods.  They hold 56 per cent of the British crisps market. <ref name="bbc.co.uk/food"> </ref> The Walkers site in Leicester is the largest crisp production plant in the world, producing over 11 million bags of crisps per day and using about 800 tons of potatoes. Lay's is the brand name for a number of potato chip varieties as well as the name of the company that founded the chip brand in the U.S. in 1932.  Lay's has been owned by PepsiCo since 1965.  Lay's is the company's primary brand with the exception of limited markets where other brands are utilized (Walkers in the United Kingdom and Ireland, Smith's in Australia, Chipsy in Egypt, Poca in Vietnam, Tapuchips in Israel, Margarita in Colombia, Sabritas in Mexico and, formerly, Hostess in Canada).  It is also called Frito-Lay. Sandora LLC (Ukrainian: Сандора ) is a Ukrainian juice company based in Mykolaiv, Ukraine.  Founded in 1995, the company currently holds a 47 percent share of the Ukrainian juice market.  In September 2007, American-based PepsiCo, Inc. purchased 80 percent ownership of Sandora's company holdings.  The M&A deal legal support was conducted by Sayenko Kharenko law firm.  In November 2007, PepsiAmericas, Inc. and PepsiCo, Inc. jointly acquired the remaining 20% of Sandora.  PepsiAmericas held a 60% interest in Sandora, and PepsiCo held 40% interest in Sandora.  PepsiCo acquired PepsiAmericas in 2010 and took full ownership of Sandora. Twisties are a type of cheese curl, corn-based snack food product, available mainly in Australia, and other Oceanian countries such as Papua New Guinea, New Caledonia, Vanuatu and Fiji, the Southeast Asian countries Malaysia, Thailand, Singapore and Brunei, and the island of Mauritius in the Indian Ocean.  It was launched in 1950 by the General Foods Corporation.  The brand name is owned by The Smith's Snackfood Company.  While originally an Australian-owned company, Smith's was acquired in August 1998 by Frito-Lay, the second largest producer of snack foods in Australia, which in turn is owned by American multi-national PepsiCo.  In Malaysia, Twisties is a product of Mondelēz International, after having been a part of Danone and later, Kraft Foods previously.  In Thailand, the Twisties trademark is owned by Lay's, which like The Smith's Snackfood Company, is owned by PepsiCo.  In New Zealand, Malta and Italy, Twisties are marketed under different names. Manzanita Sol is a brand of apple-flavored soft drinks owned by PepsiCo and is predominant in Mexico.  In the United States it is sold in 12-pack cans, 2-liter, and 20-ounce bottles.  The drink is known to be available at Walmart, Albertsons, H-E-B, Ralphs, Kmart, Food 4 Less, Jewel-Osco, Dominick's, Target, Vons, Stater Bros., United Supermarkets in the Amarillo and Lubbock, Texas area, and other smaller chains and smaller family run stores.  In Latin American countries, Manzanita Sol will compete with The Coca-Cola Company's Manzana Lift.  Manzanita Sol is PepsiCo's number two brand in Mexico, with apple being Mexico's second most popular soft drink flavor.  It is also very popular in the borderlands such as the El Paso/Juarez border.
Answer: 1965