By Amy Guthrie 

MEXICO CITY--The Mexican unit of Wal-Mart Stores Inc. said Wednesday that sales at stores open for more than a year contracted slightly in Mexico last year, in what was a tough business environment for Latin America's largest retailer.

Wal-Mart de Mexico's total sales, including at its Central America stores, expanded by 4.1% last year to 437.66 billion Mexican pesos ($29.77 billion). The unit, known as Walmex, accounts for around 6% of Wal-Mart's annual sales and is one of the Bentonville, Ark., company's biggest overseas operations.

The retailer failed to grow same-store sales last year in Mexico, its main market, amid sluggish consumer spending and a weak economy. Walmex has also struggled to turn around its Sam's Club business in the country.

The difficult operating environment contributed to a slowdown in store openings last year, with the retailer expanding its sales area by 3.9% versus an initial target to add 5.2% more square footage of selling space.

Walmex has also been dogged since 2012 by allegations that the retailer had bribed public officials to speed permits for new store openings in Mexico. U.S. Department of Justice investigations into those allegations continue.

Before those allegations, the company added about 10% of new selling space a year. A strengthening of internal oversight has resulted in slower store openings, executives say.

In October, Wal-Mart's international chief, David Cheesewright, told investors that the company planned to retool its operations in Mexico.

"Mexico is a really good business for us, but we want to rejuvenate it," Mr. Cheesewright said.

The company became leaner in 2014, exiting the restaurant business and offloading its banking efforts via asset sales.

Walmex has since overhauled its leadership, too, with Walmex Chairman Enrique Ostalé replacing Scot Rank as CEO of the company at the start of 2015. Mexican dairy giant Lala announced this week that Mr. Rank will now be its CEO.

Write to Amy Guthrie at amy.guthrie@wsj.com

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