There is not an official list, but there are a couple website that track. The OEMs have become increasingly cagey about sales numbers and breakdowns. Not long ago, all of them reported all their sales, every month, most with model breakouts. Some only report quarterly now.
Which is why I’ll say again: I am shocked GM hasn’t licensed the latest Volt platform to other OEMs who would milk it for the credit. It’s one of the best PHEV platforms out there.