I'm afraid you may have misunderstood. The SDR is a time-varying basket of USD, EUR, RMB, GBP, and JPY. At time of writing Afghanis are not part of SDR, even though Afghanistan owns some SDR.

Thanks for the clarification. The hyperlink you gave was to the general IMF website and did not contain an in-page search hit for "RMB," "Renminbi," or "China". Where can one find the size of the RMB allocation?

Presumably the IMF is not bound by the typical RMB capital controls that limit its utility for commercial entities and individuals.

12.28%

I found that information at the top of the linked page, which I just checked again was indeed the page about SDRs. Maybe they're doing some stupid redirection that's browser dependent.