I am guessing that the 3000 number is the worldwide distribution number and not the US delivery number.
I have heard that My 2012 Sherco 290 is one of two in the state of Arizona.
It would be interesting to know what that break down is. Add in the distribution as well; total US delivery and how many of what model. I have a feeling that for a specific year/make/model combo here in the states you are probably looking at low triple digit numbers, maybe even some double digit numbers. Just my guess anyway.
Total US sales of all makes and models (of a given model year) I couldn't even guess. But I agree that it would be an interesting number to see.