71,000 from North America seems very high. The last numbers I remember people figuring out was about 36,000 "licenced" LFS users (globally).
This was a few years ago, so growth would be expected, but considering North America has always been fairly weak for LFS (due to time zones and no organized racing in our evenings for a long time) for that population to be 70,000 strong seems really really crazy (and incorrect).
This was a few years ago, so growth would be expected, but considering North America has always been fairly weak for LFS (due to time zones and no organized racing in our evenings for a long time) for that population to be 70,000 strong seems really really crazy (and incorrect).