USA - bystander CPR useless

Correct me if I am wrong - but doesnt this info (see attachment below) from the 2015 King County Washington Medic One Annual Report show that bystander CPR is pointless - the save rate is 21% across the board

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But this webpage says that bystander CPR can double or triple the save rate - http://suddencardiacarrest.org/aws/SCAA/pt/sp/keepitbeating