It really is different for everyone, I don't think you can get a ballpark. It's going to depend on body composition, genetically-determined fat distribution, etc. as well as current size. Also it can vary even for yourself because the body is constantly readjusting things as you lose fat and get fitter. I can lose not much "weight" at all and be smaller, and there have been times when I lost "weight" but didn't get smaller at all!
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