Ward's Automotive Yearbook

Here's a resource that has a lot of information you probably will find elsewhere.  Ward's Automotive Yearbook. It contains sales for different models of cars, not just the aggregate brand sales.  There also a lot of other interesting statistics in this book (like most popular options on cars, etc...). 

This is a print only reference source, but if you're trying to get some Automotive Data, I think you'll find it well worth your time.