In 2024, restaurant company Wingstop (WING -2.24%) did something for the 21st year in a row: Sales went up at domestic restaurants that had been open for at least a year. To be more specific, domestic same-store sales were up a whopping 19.9% year over year, which is a number so good that it's staggering. To put its growth into perspective, the average Wingstop restaurant location had $1.6 million in annual sales at the end of 2021. At the end of 2024, however, this had grown to an annual average of $2.1 mi ...