As my colleague mentioned, from the moment the error was noted until the new data were released, many Statistics Canada employees worked hard to ensure the error did not affect other questionnaires elsewhere in the country. Canada has a population of 36 million inhabitants. We went over the processes with a fine-tooth comb to ensure the error had not occurred elsewhere. That was when we realized that between 2,500 and 3,000 people outside Quebec had been affected by the error.
On October 31st, 2017. See this statement in context.