There is the potential for dividends to be paid back to members of the banks, as there is for most multilateral development banks and international financial institutions; however, to my knowledge, that hasn't occurred. There are normally not dividends that are paid back, but that is an option that could potentially be pursued.
If there are concrete questions about the exact return on particular investments, that really happens on a project-by-project basis, and it depends on each individual country, but if your question is about money that would potentially flow back to Canada concretely in terms of the shares we've purchased, there are dividends that are accrued, but normally those are not paid back to shareholders, and I don't believe that's ever been the case.