The figures are closer to Dave Ws than the 1300.....which I suspect is the maximum number of cars the factory could build in a year. In the days of long delivery times, such items as wings were made by hand and production methods have improved the times taken to build. Production numbers have risen to over the years.
The MTW probably accounts for a quarter of production, the bulk being Trads, of which the Plus4 is the most popular. That said, with the large number of orders in for the new Aero8, the balance may well change!