[Perfectlap]

Resale has little to do with the mechanical merits of the car (excluding mileage) and much more to do with supply. This chart should have a second line indicating total production by year or number of used sales by year. And if possible the average mileage of each model year when sold.

Also those prices don't reflect what I've seen on retail sites like Auto trader for m97 vs 9A1. There's a much bigger gap between in warranty and off warrant cars.