RetailSails has recently come out with its 2012 report on various metrics relevant to the retail industry. One of the most important figures is sales per square foot, and again Apple (AAPL 0.53%) tops this list and leads by a healthy margin, with $6,050 of sales per square foot. No. 2 on the list was diamond retailer Tiffany (TIF) at $3,017 per square foot. The rest of the top five were apparel retailers lululemon athletica (LULU 0.52%) at $1,936 per square foot, Coach (TPR 4.30%) at $1,871 per square foot, and then Michael Kors (CPRI -0.17%) with $1,431 per square foot. Apple dominates this list by nearly double the next-closest contender. It shows how important retail is for Apple at a time when its retail strategy is in transition after John Browett was let go as retail chief.