Does the following sentence make sense?

I took a survey on how many cars of which color were sold last month.

For example, this survey says that five red cars were sold, three black cars were sold, ....

I am not sure whether the "of which color" is correct.

Could you please explain why this expression may be wrong?

closed as off-topic by TrevorD, Edwin Ashworth, Drew, BladorthinTheGrey, tchrist Dec 30 '16 at 14:16

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Neither "which color" nor "what color" sound right to me. How about:

I took a survey on how many cars of each colour were sold last month.

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