How about this:
Nissan 370Z Production Statistics
It only lists the US and Canada, and it's only good through production date 7/13, but it'll give you an idea. (8278 total Roadsters produced as of that date.)
The listed total of 370Z Roadsters sold is not much more than one good month of Mustang or Camaro sales. Some see that as a bad thing. I'm not one of them.
These are rare beasts indeed. I'm rather proud of that fact.