If you’re a fan of Elon Musk’s automotive brainchild start-up turned innovative behemoth, this summer has its fair share of good news. In the month of July alone, Automotive News reported that Tesla managed to sell over 5,100 Cybertrucks, not to mention their other EVs. Tesla also managed to secure pre-orders for more than 5,500 of their angular trucks in the same period, about half of the total registrations of all EV trucks in the US. Put another way, out of everyone who wants an EV truck badly enough to pre-register, one out of every two of them are putting their money behind Tesla.

Notice something a little strange about the math, however? You’re not alone: there’s about a 400 unit shortage between the number of trucks Tesla can physically produce, and the number people want to buy. All told, Tesla has an estimated backlog of two million Cybertruck pre-orders, and month by month that number is only growing larger thanks to this deficit.