I don't have any offhand, but I have the statistics that in 2016 a survey found 47% of early career health researchers had seriously considered leaving the country to pursue their education elsewhere, because of financial concerns.
This is something we've been hearing.
I recommend that you ask this question specifically to Sarah, from the Support our Science movement. She is testifying next week, and she has been a great champion for collecting the stories of these graduate students in Canada, highlighting the experiences they have been having, their struggles about securing funding, and the considerations they have while trying to pursue their research in Canada.