It is very clear if you look at the figures. In 1998, there were two cases and now there are between 80 and 100 each year. Clearly it is expanding.
I really recommend that you read a study by two professors at the University of British Columbia, Catherine Dauvergne and Asha Kaushal. It is called The Growing Culture of Exclusion: Trends in Canadian Refugee Exclusions. It examines the cases of a number of people who have done nothing violent, who may have had certain roles without knowing what was happening elsewhere in the movement they were part of, like Salma, for example. Clearly, anyone who is denied the protection they need becomes a potential case of refoulement to persecution.