so this number came out in a FB conversation with Key Parts. apparently if you're in the parts business you can pay for VIO (vehicles in operation) numbers from the government. this can be state, regional or continent wide. 18,600 refers to the number of registered MJs in the US and Canada. obviously there are others in Mexico and abroad and in peoples backyards, so it's not the true number of MJs left, but it's a bit scary to me that it's so small. essentially we're down to ~10%.