I think I used the word “impoverished” when talking about statistics in this country in many ways. This is another area. I'm only able to get these data for Ontario. We don't even have these data for women. You would think it would be relatively easy.
I have been looking at this issue in another context recently, and the difficulty is that there are shifting definitions. We don't have clear definitions of what other groups are. I don't really want to defend the statistical agency in this case, but the circumstances are such that measuring who is an aboriginal person, for example, is not easy over time. In its population data, Statistics Canada reported that the number of aboriginal people increased by 106% between 1981 and 1991. That's largely because people were willing to identify themselves as aboriginal in 1991, and weren't willing to do so in 1981. We have no information about how aboriginal status is collected in prisons.
So the simple answer is that this is an area where I have sympathy for the statistical agency not having data, though there are other areas where I think they should have data, but don't.