That goes back to the earlier question about coherence. We explain that in paragraph 8.30 of the report. Again, the agency identified that the change to the national household survey was a significant change in method, thus there could be an impact on the comparability of the data over time.
One step that the agency took was to make sure that users understood that they have to use caution when making those types of comparisons. Again, that's explained under the section of the audit that deals with the coherence aspect of their quality framework.