Upgrading Big Game Hunting Traps question.

Does upgrading Big Game Hunting traps also increase their % damage or only their base damage?
Like the BGH Ballista deals 38 + 8% dmg at tire 1. Does it deal 93 + 19,5% at tire 7, or does it deal 93 + 8%?
Like the BGH Ballista deals 38 + 8% dmg at tire 1. Does it deal 93 + 19,5% at tire 7, or does it deal 93 + 8%?
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https://orcsmustdieunchained.gamepedia.com/Big_Game_Hunting_Arrow_Wall
I couldn't find the part that is answering my question.