I can talk about part of the process. Basically, what occurred is what we call the technical visit. The visit actually happened before my arrival at the mission, but they looked at a number of factors, as you mentioned--refusal rates, enforcement rates, and refugee claim rates.
They also looked at the issue of document security: what was the integrity of the Taiwanese passport or the Taiwanese passport application process? There were other factors, such as information sharing on passport information, or other enforcement-like matters. A number of factors were considered in total. Then my understanding is that recommendations were made and partner ministries were consulted. But perhaps Rénald can speak more to this.