The information comes from our missions abroad, which are processing these applications. They report on their acceptance and refusal rates, the characteristics of the cases they're able to accept, and the cases that do not qualify. It also comes from our discussions with the sponsorship agreement holders, who freely admit that they are responding to people in their community who are asking them to help them bring their family members from abroad. We know from the outset that there is a family connection in Canada, but one can't assume that just because there's a family connection the relative living abroad was also a refugee in need of protection.
So it's through those two things: what we learned from our sponsorship agreement holders and other private sponsorship groups, and the analysis that's provided by our visa offices abroad when they interview and process the privately sponsored refugees.