Aged 16-74. IUSELL - Selling of goods or services via a website or app (e.g. eBay, Facebook, Marketplace, Shpock)   1 - Ticked   0 - Not ticked   9 - Not applicable (IU=Blank or IU ne 1)  Individuals Purchasing or ordering goods or services sum of IND_WGHT where (IUSELL=1)