I believe that the response rate for the questionnaire is presently 97%. In fact, it is this rate that assures researchers and governments that the data is reliable. That is the case for any study. In terms of data certainty, the most important element is the percentage of people who participate in the survey. The closer this percentage comes to the total number of individuals in the population studied, the more accurate the snapshot and the easier it is to use the data for other, much more refined studies. It results in a much more nuanced understanding of our reality.
The participation rate is important but the number of participants is also quite crucial. For example, if you need information about the situation of young parents under 24 years of age—and God knows that young families are a reality—a sufficient number of young people must participate in the survey in order to obtain the data required to establish family policies, for example. That is the case for all areas. The greater the number of respondents, the more accurate the data, the more nuanced the analysis of the data, and the more your public policies are in tune with reality.