How do I know if my car value has dropped and how much it has dropped?

I bought a new car on June this year, and 2 weeks ago, an incident happened and the car was damaged pretty bad. The car has been fixed and now it looks like new. The incident is not my fault, and I believe it is cause by a defect of the car itself even if the maker, which is Honda, denied it. I probably need a lawyer to talk to them but that is another topic. Now as the car has been repaired once, how do I know if t he car value has dropped? And how much it has dropped. Is there any place I can take the car and evaluate how much its value is?
Added (1). The reason I'm asking the questions is that I plan to ask Honda to pay for my financial damage, including the depreciation of the car, my rental car, my insurance deduction, and so on. I have specific numbers for all the others except the depreciation of the car. That is why I want to know if there's anyway to find out.

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