Query to fetch approvers list

We are trying to customize performance seeded report and trying to fetch the list of approvers/managers who has approved the document. We are trying to get the details from “FA_FUSION_SOAINFRA.WFTASKHISTORY, HRC_TXN_FND_BPM_TASK_VL”  tables but in some cases this table is not returning data although document has been approved by multiple approvers. Can you please share the query or table names where details are getting stored.