The same website you used (cars.com) also did an article on the free fall of TDI values - https://www.cars.com/articles/used-vw-diesel-prices-continue-to-decline--1420682860308/how much worse have the affected tdi's been dropping compared to other fuel efficient vehicles are being effected by outside influences? i.e.. low fuel prices, longer term purchase loans and low financing rates. a quick google search shows that these factors have not been friendly to any high mpg cars.
https://www.cars.com/articles/value-of-fuel-efficient-cars-tank-amid-low-gas-prices-1420682551886/
If you are a "proud" Jetta Sportwagon TDI owner like myself then in 2 1/2 months your car value dropped more than 10%. If that trend keeps up it will be one of the fastest depreciating car values ever.
we are blessed to own such fine cars