Certainly the Netherlands and Belgium probably have the most robust data collection, because they have an oversight process, similar to what we have in Quebec, through which they review, through a commission, every declaration of a euthanasia death. They would have data on the numbers of requests, those that were accepted and those that were denied, as well as some information about the patients. That's what we can rely upon.
There are growing datasets in other countries that I've mentioned, but some of them are fairly young regimes, and that data takes time to accumulate.