Sales volume index in trade base 2010
Sales volume indices for all trade are monthly indices in volume: they track variations in the volume of sales of the companies in the sectors concerned.
They fall under the European regulation on short-term statistics (Council Regulation (EC) No 1165/98 of 19 May 1998, as amended by its subsequent amendments).
In order to limit the statistical burden on businesses, and because information is collected on a regular basis by the tax authority, INSEE uses the value added tax (VAT) tax returns of companies to build a Monthly indices of turnover.
The tax authority transmits the VAT returns of companies to INSEE on a monthly basis.
Until 2015, turnover indices were calculated from a sample of companies reporting VAT on a monthly basis.
This sample, of some 160,000 companies, was renewed each year. It included an exhaustive stratum (the largest companies in each sector) and was drawn proportionally to turnover on the rest of the field.
Since 2016, all monthly returns are used to calculate the indices.
Beginning in 2017, INSEE calculates monthly indexes by volume in total trade by deflating the turnover indices in value: they trace the evolution of the volume of sales.