If there is a possiblity of repeated %Trace values, then you might need to use this array formula:
=INDEX(A$3:A$15,SMALL(IF($M$3:$M$15=$M18,ROW($M$3: $M$15)-ROW($M$3)+1),COUNTIF($M$18:$M18,$M18)))
confirmed with CTRL+SHIFT+ENTER not just ENTER and copied down and over.
This will get the unique matches for the repeated percentages
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