At what size can hail start damaging your car?

This is just a curious question...

A couple of days ago, I drove through a severe thunderstorm that was spewing out a steady stream of 1/2" - 3/4" hail stones. It made quite a racket, and although my car emerged unscathed, I couldn't help but wonder if I was coming dangerously close to having a car full of dents.

Does anyone know about how big the hail in a thunderstorm has to be before it can start putting dents in a car?
 
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