The 2021 tables contain the most recently revised Annual Retail Trade Survey and Supplemental E-commerce data. The historical Annual Retail Trade Survey and Supplemental E-commerce releases (before 2021) do not possess the most up-to-date data. The Supplemental E-Commerce data were first published in 2015. The latest Detailed Operating Expenses data can be found under 2017. For more information about sampling, data collection, estimation, and benchmarking, see the Methodology section.