We conduct surveys all the time.
I was explaining to you that every month we survey millions of households regarding the level of unemployment. The science and the statistics help us to obtain high-quality data through surveys. We don't need to carry out a census. We don't carry out the census every month. That wouldn't be practical.
According to science, high-quality data can be obtained. We've been collecting high-quality data on official languages since the 1981 census using the long-form questionnaire.