There are certain regions from where spousal sponsorship application refusal rates have increased by 50%. The reason for the refusals was mainly fake marriages. The regions include South Asia and Africa. The spousal sponsorship applicant must provide clear information and evidence about the relationship and marriage. When an immigration officer is not convinced with the information and evidence to evaluate the application, then they call you for an interview. So far, Canadians sponsored 32,165 foreign spouses in 2019, which is 20% of all immigrants in this year. In 2018, the total number of spousal sponsorship immigrants was also about 20% or 62,890 immigrants.

News source: https://www.elaarimmigration.ca/news/increasing-spousal-sponsorship-refusal-rate/