Perhaps I'll add one point.
As the minister indicated, it can, quite often, be difficult to know how much you're not getting, but we have estimates of that. We produce a document on the tax gap, which looks at a number of areas of the tax system and how much we are collecting relative to what we think we should be. Now, there's a methodology and people can debate that, but we try to estimate it.
I don't have the number you're specifically looking for at my fingertips, but I'd be happy to send to the committee our document on that, which we repeat every few years. I would say that it's an estimate based on a methodology, but we do try then use it to help direct or influence our compliance efforts and where we want to direct our efforts.