This tabular view allows you to review actual performance details of your products from Google Shopping.
Additionally, you can click on any product to trigger it's own detailed performance chart which will appear below the primary table. Just as with the Performance Chart, you can alter the appearance and charted metrics of this graph.
This graph can be incredibly helpful when analyzing performance AFTER you have performed a price change. For Example:
After lowering a product's price, review the conversion history over time to see if the product generates more sales. If no change is noticed over a significant span of time (30 days), then lowering the price may have little affect on conversion rates.
This could be indicative of other elements outside of product price that are influencing shopper behavior such as non-competitive fulfillment options (Free Shipping, No Tax, etc.)