Can someone please help me with this homework question? I got the wrong answer and I want to understand what I did wrong. much appreciated!

Assume that you recently applied for a student loan to go to graduate school. As part of the application process, your bank requested a list of your assets. Aside from an extensive CD collection, your only other asset is a pickup truck. You purchased the truck six years ago for $15,000. Its current fair value is approximately $5,000. a. What factors caused your pickup truck to decline $10,000 in value