You can view how your sales are trending for every listing in your catalogue under the Sales History column in the Manage Pricing page. Under the default settings, this column will display:
|Most recent 30 days (May 2015 to June 2015) sales||Previous 30 days (April 2015 to May 2015) sales||Value displayed in Sales History column|
To view a graphical display of your sales history for a listing, click on the value displayed in the Sales History column for the listing.
To change the date range for which you want to view your sales history: