in 1994. Walmart stores opened throughout the rest of the U.S., with Vermont being the last state to get a store in 1995. The company also opened stores outside North America, entering South America in 1995 with stores in Argentina and Brazil; and Europe in July 1999, buying Asda in the United Kingdom for . In 1997, Walmart was added to the Dow Jones Industrial Average. In 1998, Walmart introduced the Neighborhood Market concept with three stores in Arkansas. By 2005, estimates indicate that the company controlled about 20 percent of the retail grocery and consumables business. In 2000, H. Lee Scott became Walmart's president and CEO as the company's sales increased to $165 billion. In 2002, it was listed for the first time as America's largest corporation on the Fortune 500 list, with revenues of $219.8 billion and profits of $6.7 billion. It has remained there every year except 2006, 2009, and 2012. In 2005, Walmart reported in sales, more than 6,200 facilities around the world—including 3,800 stores in the United States and 2,800 elsewhere, employing more than 1.6 million associates. Its U.S. presence grew so rapidly that only small pockets of the country remained more than from the nearest store. As Walmart expanded rapidly into the world's largest corporation, many critics worried about its effect on local communities, particularly small towns with many "mom and pop" stores. There have been several studies on the economic impact of Walmart on small towns and local businesses, jobs, and taxpayers. In one, Kenneth Stone, a professor of economics at Iowa State University, found that some small towns can lose almost half of their retail trade within ten years of a Walmart store opening. However, in another study, he compared the changes to what small-town shops had faced in the past—including the development of the railroads, the advent of the Sears Roebuck catalog, and the arrival of shopping malls—and concluded that shop owners who adapt to changes in the retail market can thrive after Walmart arrives. A later study in collaboration with Mississippi State University showed that there are "both positive and negative impacts on existing stores in the area where the new supercenter locates." In the aftermath of Hurricane Katrina in September 2005, Walmart used its logistics network to organize a rapid response to the disaster, donating $20 million, 1,500 truckloads of merchandise, food for 100,000 meals, and the promise of