Add Column for sales volume

Add a column in both collection view and search view that indicates sales volume per month over the last year.  For example: An item with 100 sales over the past 12 months would have a value of 8.33 (100 / 12 months = 8.33 sales per month) and a card with only 6 sales per year would have a value of 0.5 (6 / 12 months).  Possibly color-code it to indicate whether sales volume trend is increasing or decreasing over the past few months (ie: green=positive trend, red=negative trend).