BEIJING: China's top 100 supermarket enterprises maintained growth in online sales last year, data from an industry association showed. In 2021, online sales of the country's top-100 supermarkets amounted to nearly 100 billion yuan (about $15 billion), up 40 percent year on year, according to the China Chain Store and Franchise Association. The total number of stores owned by these enterprises gained 2.9 percent from a year ago to about 30,000, with 11 firms logging a year-on-year growth of over 5 percent in sales revenue and store numbers. Due to adverse factors, such as Covid-19, the top 100 supermarkets saw…