Cells are of the form Rate (X%) where:
Since crash rates are #crashes / usage_khours a low (X%) in usage_khours can result in an inflation of crash rates.
To estimate how much of an inflation, take a relatively-stable crash type (like P) and compare its (X%) to usage_khours'.
As of yet, no model has been developed to do this properly, so YMMV.
Data comes from this query.