The Customer Usage Data report is set to 90 day limitation history.
SAP SuccessFactors Learning
The report is limited to 90 days to ensure the queries would not timeout by reaching the thresholds set.
If older data is required, then the report must be ran with a specific set timeframe using the date search fields provided.
Customer Usage Data, 90 days, b1605 , KBA , LOD-SF-LMS-REP , Reporting Data , Problem
SAP SuccessFactors Learning all versions