Running a city is tough. Running a country is even tougher. Yesterday, we got our 2021 Census forms. The numbers the form supplies makes the government's task a little easier. The info is kept private and not open to public view for something in the order of 92 years.
And how does the government get the info? Do participants use the mail? Not necessarily. If one likes, the forms can be submitted using a unique identification number and sent directly to the government from one's home computer.