They have a part of this information. As I understand it, the way they gather information on the rates of applications, approvals, and denials is by category of application. The members of this committee will know better than I that there are a number of categories under which you can apply for the disability tax credit, one of which is life-sustaining therapy. That's the most pertinent one.
On November 7th, 2017. See this statement in context.