Nowhere in that link, nor the article on PubMed describes PMC as a part of PubMed. Moreover, the relevant legal act, the Consolidated Appropriations Act of 2008, requires NIH-funded research to be published in PMC, so it's PMC's budget that is relevant here.

>Nowhere in that link, nor the article on PubMed describes PMC as a part of PubMed

Yes, this is why I'm confused why you'd dispute the PubMed annual budget by posting PMC budget.

PubMed is much bigger and more widely used (NIH data shows it), and it gives free access to lots of papers, gene databanks, and other public sources.

You claimed that PMC is a part of PubMed, but there's nothing that says so. Anyway, NIH-funded research is required to be published on PMC, not PubMed, so the cost of PMC is the one to be examined for the question of a mandatory open access policy. So all of what PubMed does is entirely irrelevant to this question, since PMC is where these have to be published to.