Rather than a bottle neck, I'd say the production line wasn't up for the majority of the quarter. At 220 cars in ~120days, that is an 8-12 hour average takt time. Since nobody does that in production, it's more likely that they take the line down, fix things, and bring it up again days later. I'd be more interested in the change in delivery rate over the 3 months. If 218 cars were delivered on the last day, it would be 6k/mo or 70k/yr, great! More likely progress has been slow and hopefully steady (30=>60=>90 per month) for their ramp.