It will be extremely helpful to add on the graph a vertical line while doing mouse over that also displays the average throughput between starts day on the graph and the number of days pointed with the mouse-over

Also, It will be extremely helpful to add on the Throughput - Card Count header the Lane, Start column, End column. For example: instead or reading “Throughput - Card Count” it could read “Throughput - Card Count | Lane: UK Customer | From: Design | To: Internal Verification”