VAIM: value added imports, in 4 dimensions(import regions, source sectors, source regions, years).
Notation: the import region is where value added is finally absorbed in, it is also the destination region in VAEX.In WIOD 2016, there are 56 sectors and 44 regions. In addition to the 56 sectors, there are 5 aggregated levels results (Total, goods, manufacture, all service and some services related to production).