INSEE revises the values of its statistics so that they reflect reality as accurately as possible and to guarantee their relevance and reliability. It uses well-established, standardized and planned procedures according to international standards. It announces the revisions simultaneously with their release or in advance according to a protocol adapted to the source of the revisions, their scale and the sensitivity of the published statistics. All the explanations necessary to understand these revisions accompany the dissemination of the statistical sources concerned on the insee.fr site.