US retail industry sales will grow by 3.8-4.4 per cent in 2018 over last year and online and other non-store sales, which are included in the overall number, are expected to increase by 10-12 per cent, according to the economic forecast for this year by the National Retail Federation (NRF). The numbers exclude automobiles, gasoline stations and restaurants. Retail sales grew 3.9 per cent in 2017 over 2016 to $3.53 tr, the US Census bureau’s preliminary estimate for the year shows. The number is subject to revision but exceeded NRF’s forecast for growth between 3.2 and 3.8 per cent, according to a report