The preliminary results of foreign trade statistics are replaced by final results about 6-7 months after the end of the reference year. The individual monthly results are revised. The global final results are referred to in a press report. When major methodological changes in foreign trade statistics are planned, these are communicated in detail in advance to the reporting enterprises and the clients. Generally, such information is provided by special documents or letters explaining the envisaged changes.
Reference is made to changes of methods within the framework of publications or press reports.